diff --git a/.travis.yml b/.travis.yml
new file mode 100644
index 000000000..3f2ba725b
--- /dev/null
+++ b/.travis.yml
@@ -0,0 +1,20 @@
+dist: trusty
+group: stable
+
+language: scala
+jdk: oraclejdk8
+
+script: sbt scripted
+
+# Undo _JAVA_OPTIONS environment variable
+before_script:
+  - unset _JAVA_OPTIONS
+
+cache:
+  directories:
+    - $HOME/.ivy2/cache
+    - $HOME/.sbt
+
+before_cache:
+  - find $HOME/.ivy2/cache -name "ivydata-*.properties" -delete
+  - find $HOME/.sbt        -name "*.lock"               -delete
diff --git a/README.markdown b/README.markdown
new file mode 100644
index 000000000..ca91dc2f3
--- /dev/null
+++ b/README.markdown
@@ -0,0 +1,46 @@
+sbt-projectmatrix
+=================
+
+cross building using subprojects.
+
+This is an experimental plugin that implements better cross building.
+
+setup
+-----
+
+**Requirements**: Requires sbt 1.2.0-M1 or above.
+
+In `project/plugins.sbt`:
+
+```scala
+addSbtPlugin("com.eed3si9n" % "sbt-projectmatrix" % "0.1.0")
+```
+
+usage
+-----
+
+To use `projectMatrix`:
+
+```scala
+lazy val core = (projectMatrix in file("core"))
+  .scalaVersions("2.12.6", "2.11.12")
+  .settings(
+    name := "core"
+  )
+  .jvmPlatform()
+
+lazy val app = (projectMatrix in file("app"))
+  .dependsOn(core)
+  .scalaVersions("2.12.6")
+  .settings(
+    name := "app"
+  )
+  .jvmPlatform()
+```
+
+This sets up basic project matrices one supporting both 2.11 and 2.12, and the other supporting only 2.12.
+
+license
+-------
+
+MIT License
diff --git a/build.sbt b/build.sbt
new file mode 100644
index 000000000..5252f3387
--- /dev/null
+++ b/build.sbt
@@ -0,0 +1,19 @@
+ThisBuild / organization := "com.eed3si9n"
+ThisBuild / version      := "0.1.0-SNAPSHOT"
+ThisBuild / description  := "sbt plugin to define project matrix for cross building"
+ThisBuild / licenses     := Seq("MIT License" -> url("https://github.com/sbt/sbt-projectmatrix/blob/master/LICENSE"))
+
+lazy val root = (project in file("."))
+  .enablePlugins(SbtPlugin)
+  .settings(
+    sbtPlugin := true,
+    name := "sbt-projectmatrix",
+    scalacOptions := Seq("-deprecation", "-unchecked"),
+    publishMavenStyle := false,
+    bintrayOrganization in bintray := None,
+    bintrayRepository := "sbt-plugins",
+    scriptedLaunchOpts := { scriptedLaunchOpts.value ++
+      Seq("-Xmx1024M", "-Dplugin.version=" + version.value)
+    },
+    scriptedBufferLog := false,
+  )
diff --git a/project/build.properties b/project/build.properties
new file mode 100644
index 000000000..cec4f6083
--- /dev/null
+++ b/project/build.properties
@@ -0,0 +1 @@
+sbt.version=1.2.0-M1
diff --git a/project/plugins.sbt b/project/plugins.sbt
new file mode 100644
index 000000000..e5ae08691
--- /dev/null
+++ b/project/plugins.sbt
@@ -0,0 +1,2 @@
+addSbtPlugin("org.foundweekends" % "sbt-bintray" % "0.5.4")
+addSbtPlugin("com.jsuereth" % "sbt-pgp" % "1.1.1")
diff --git a/src/main/scala/sbt/ProjectMatrix.scala b/src/main/scala/sbt/ProjectMatrix.scala
new file mode 100644
index 000000000..7b696b3d4
--- /dev/null
+++ b/src/main/scala/sbt/ProjectMatrix.scala
@@ -0,0 +1,289 @@
+package sbt
+
+import java.util.Locale
+import scala.collection.immutable.ListMap
+import Keys._
+import sbt.librarymanagement.CrossVersion.partialVersion
+
+/**
+ * A project matrix is an implementation of a composite project
+ * that represents cross building across some axis (such as platform)
+ * and Scala version.
+ *
+ *  {{{
+ *  lazy val core = (projectMatrix in file("core"))
+ *    .scalaVersions("2.12.6", "2.11.12")
+ *    .settings(
+ *      name := "core"
+ *    )
+ *    .jvmPlatform()
+ *  }}}
+ */
+sealed trait ProjectMatrix extends CompositeProject {
+  def scalaVersions(sv: String*): ProjectMatrix
+
+  def id: String
+
+  /** The base directory for the project matrix.*/
+  def base: sbt.File
+
+  def withId(id: String): ProjectMatrix
+
+  /** Sets the base directory for this project matrix.*/
+  def in(dir: sbt.File): ProjectMatrix
+
+  /** Adds new configurations directly to this project.  To override an existing configuration, use `overrideConfigs`. */
+  def configs(cs: Configuration*): ProjectMatrix
+
+  /** Adds classpath dependencies on internal or external projects. */
+  def dependsOn(deps: MatrixClasspathDep[ProjectMatrixReference]*): ProjectMatrix
+
+  /**
+   * Adds projects to be aggregated.  When a user requests a task to run on this project from the command line,
+   * the task will also be run in aggregated projects.
+   */
+  def aggregate(refs: ProjectMatrixReference*): ProjectMatrix
+
+  /** Appends settings to the current settings sequence for this project. */
+  def settings(ss: Def.SettingsDefinition*): ProjectMatrix
+
+  /**
+   * Sets the [[AutoPlugin]]s of this project.
+   * A [[AutoPlugin]] is a common label that is used by plugins to determine what settings, if any, to enable on a project.
+   */
+  def enablePlugins(ns: Plugins*): ProjectMatrix
+
+  /** Disable the given plugins on this project. */
+  def disablePlugins(ps: AutoPlugin*): ProjectMatrix
+
+  def custom(
+      idSuffix: String,
+      directorySuffix: String,
+      scalaVersions: Seq[String],
+      process: Project => Project
+  ): ProjectMatrix
+
+  def jvmPlatform(settings: Setting[_]*): ProjectMatrix
+
+  def jvm: ProjectFinder
+
+  def projectRefs: Seq[ProjectReference]
+}
+
+/** Represents a reference to a project matrix with an optional configuration string.
+ */
+sealed trait MatrixClasspathDep[MR <: ProjectMatrixReference] {
+  def matrix: MR; def configuration: Option[String]
+}
+
+trait ProjectFinder {
+  def apply(scalaVersion: String): Project
+  def get: Seq[Project]
+}
+
+object ProjectMatrix {
+  import sbt.io.syntax._
+
+  val jvmIdSuffix: String = "JVM"
+  val jvmDirectorySuffix: String = "-jvm"
+
+  /** A row in the project matrix, typically representing a platform.
+   */
+  final class ProjectRow(
+      val idSuffix: String,
+      val directorySuffix: String,
+      val scalaVersions: Seq[String],
+      val process: Project => Project
+  ) {}
+
+  final case class MatrixClasspathDependency(
+      matrix: ProjectMatrixReference,
+      configuration: Option[String]
+  ) extends MatrixClasspathDep[ProjectMatrixReference]
+
+  private final class ProjectMatrixDef(
+      val id: String,
+      val base: sbt.File,
+      val scalaVersions: Seq[String],
+      val rows: Seq[ProjectRow],
+      val aggregate: Seq[ProjectMatrixReference],
+      val dependencies: Seq[MatrixClasspathDep[ProjectMatrixReference]],
+      val settings: Seq[Def.Setting[_]],
+      val configurations: Seq[Configuration],
+      val plugins: Plugins
+  ) extends ProjectMatrix { self =>
+    lazy val projectMatrix: ListMap[(ProjectRow, String), Project] = {
+      ListMap((for {
+        r <- rows
+        svs = if (r.scalaVersions.nonEmpty) r.scalaVersions
+        else if (scalaVersions.nonEmpty) scalaVersions
+        else sys.error(s"project matrix $id must specify scalaVersions.")
+        sv <- svs
+      } yield {
+        val idSuffix = r.idSuffix + scalaVersionIdSuffix(sv)
+        val svDirSuffix = r.directorySuffix + "-" + scalaVersionDirSuffix(sv)
+        val childId = self.id + idSuffix
+        val deps = dependencies map {
+          case MatrixClasspathDependency(matrix: LocalProjectMatrix, configuration) =>
+            ClasspathDependency(LocalProject(matrix.id + idSuffix), configuration)
+        }
+        val aggs = aggregate map {
+          case ref: LocalProjectMatrix => LocalProject(ref.id + idSuffix)
+        }
+        val p = Project(childId, new sbt.File(childId).getAbsoluteFile)
+          .dependsOn(deps: _*)
+          .aggregate(aggs: _*)
+          .setPlugins(plugins)
+          .configs(configurations: _*)
+          .settings(
+            Keys.scalaVersion := sv,
+            target := base.getAbsoluteFile / "target" / svDirSuffix.dropWhile(_ == '-'),
+            crossTarget := Keys.target.value,
+            sourceDirectory := base.getAbsoluteFile / "src",
+            inConfig(Compile)(makeSources(r.directorySuffix, svDirSuffix)),
+            inConfig(Test)(makeSources(r.directorySuffix, svDirSuffix))
+          )
+          .settings(self.settings)
+
+        (r, sv) -> r.process(p)
+      }): _*)
+    }
+
+    override lazy val componentProjects: Seq[Project] = projectMatrix.values.toList
+
+    private def makeSources(dirSuffix: String, svDirSuffix: String): Setting[_] = {
+      unmanagedSourceDirectories ++= Seq(
+        scalaSource.value.getParentFile / s"scala${dirSuffix}",
+        scalaSource.value.getParentFile / s"scala$svDirSuffix"
+      )
+    }
+
+    private def scalaVersionIdSuffix(sv: String): String = {
+      scalaVersionDirSuffix(sv).toLowerCase(Locale.ENGLISH).replaceAll("""\W+""", "_")
+    }
+
+    private def scalaVersionDirSuffix(sv: String): String =
+      partialVersion(sv) match {
+        case Some((m, n)) => s"$m.$n"
+        case _            => sv
+      }
+
+    override def withId(id: String): ProjectMatrix = copy(id = id)
+
+    override def in(dir: sbt.File): ProjectMatrix = copy(base = dir)
+
+    override def configs(cs: Configuration*): ProjectMatrix =
+      copy(configurations = configurations ++ cs)
+
+    override def scalaVersions(sv: String*): ProjectMatrix =
+      copy(scalaVersions = sv)
+
+    override def aggregate(refs: ProjectMatrixReference*): ProjectMatrix =
+      copy(aggregate = (aggregate: Seq[ProjectMatrixReference]) ++ refs)
+
+    override def dependsOn(deps: MatrixClasspathDep[ProjectMatrixReference]*): ProjectMatrix =
+      copy(dependencies = dependencies ++ deps)
+
+    /** Appends settings to the current settings sequence for this project. */
+    override def settings(ss: Def.SettingsDefinition*): ProjectMatrix =
+      copy(settings = (settings: Seq[Def.Setting[_]]) ++ Def.settings(ss: _*))
+
+    override def enablePlugins(ns: Plugins*): ProjectMatrix =
+      setPlugins(ns.foldLeft(plugins)(Plugins.and))
+
+    override def disablePlugins(ps: AutoPlugin*): ProjectMatrix =
+      setPlugins(Plugins.and(plugins, Plugins.And(ps.map(p => Plugins.Exclude(p)).toList)))
+
+    def setPlugins(ns: Plugins): ProjectMatrix = copy(plugins = ns)
+
+    override def jvmPlatform(settings: Setting[_]*): ProjectMatrix =
+      custom(jvmIdSuffix, jvmDirectorySuffix, Nil, { _.settings(settings) })
+
+    override def jvm: ProjectFinder = new ProjectFinder {
+      def get: Seq[Project] = projectMatrix.toSeq collect {
+        case ((r, sv), v) if r.idSuffix == jvmIdSuffix => v
+      }
+      def apply(sv: String): Project =
+        (projectMatrix.toSeq collect {
+          case ((r, `sv`), v) if r.idSuffix == jvmIdSuffix => v
+        }).headOption.getOrElse(sys.error(s"$sv was not found"))
+    }
+
+    override def projectRefs: Seq[ProjectReference] =
+      componentProjects map { case p => (p: ProjectReference) }
+
+    override def custom(
+        idSuffix: String,
+        directorySuffix: String,
+        scalaVersions: Seq[String],
+        process: Project => Project
+    ): ProjectMatrix =
+      copy(rows = rows :+ new ProjectRow(idSuffix, directorySuffix, scalaVersions, process))
+
+    def copy(
+        id: String = id,
+        base: sbt.File = base,
+        scalaVersions: Seq[String] = scalaVersions,
+        rows: Seq[ProjectRow] = rows,
+        aggregate: Seq[ProjectMatrixReference] = aggregate,
+        dependencies: Seq[MatrixClasspathDep[ProjectMatrixReference]] = dependencies,
+        settings: Seq[Setting[_]] = settings,
+        configurations: Seq[Configuration] = configurations,
+        plugins: Plugins = plugins
+    ): ProjectMatrix =
+      unresolved(
+        id,
+        base,
+        scalaVersions,
+        rows,
+        aggregate,
+        dependencies,
+        settings,
+        configurations,
+        plugins
+      )
+  }
+
+  def apply(id: String, base: sbt.File): ProjectMatrix = {
+    unresolved(id, base, Nil, Nil, Nil, Nil, Nil, Nil, Plugins.Empty)
+  }
+
+  private[sbt] def unresolved(
+      id: String,
+      base: sbt.File,
+      scalaVersions: Seq[String],
+      rows: Seq[ProjectRow],
+      aggregate: Seq[ProjectMatrixReference],
+      dependencies: Seq[MatrixClasspathDep[ProjectMatrixReference]],
+      settings: Seq[Def.Setting[_]],
+      configurations: Seq[Configuration],
+      plugins: Plugins
+  ): ProjectMatrix =
+    new ProjectMatrixDef(
+      id,
+      base,
+      scalaVersions,
+      rows,
+      aggregate,
+      dependencies,
+      settings,
+      configurations,
+      plugins
+    )
+
+  implicit def projectMatrixToLocalProjectMatrix(m: ProjectMatrix): LocalProjectMatrix =
+    LocalProjectMatrix(m.id)
+
+  import scala.reflect.macros._
+
+  def projectMatrixMacroImpl(c: blackbox.Context): c.Expr[ProjectMatrix] = {
+    import c.universe._
+    val enclosingValName = std.KeyMacro.definingValName(
+      c,
+      methodName =>
+        s"""$methodName must be directly assigned to a val, such as `val x = $methodName`. Alternatively, you can use `sbt.ProjectMatrix.apply`"""
+    )
+    val name = c.Expr[String](Literal(Constant(enclosingValName)))
+    reify { ProjectMatrix(name.splice, new sbt.File(name.splice)) }
+  }
+}
diff --git a/src/main/scala/sbt/ProjectMatrixReference.scala b/src/main/scala/sbt/ProjectMatrixReference.scala
new file mode 100644
index 000000000..2f7d4b8c2
--- /dev/null
+++ b/src/main/scala/sbt/ProjectMatrixReference.scala
@@ -0,0 +1,7 @@
+package sbt
+
+/** Identifies a project matrix. */
+sealed trait ProjectMatrixReference
+
+/** Identifies a project in the current build context. */
+final case class LocalProjectMatrix(id: String) extends ProjectMatrixReference
diff --git a/src/main/scala/sbtprojectmatrix/ProjectMatrixPlugin.scala b/src/main/scala/sbtprojectmatrix/ProjectMatrixPlugin.scala
new file mode 100644
index 000000000..0fceae49d
--- /dev/null
+++ b/src/main/scala/sbtprojectmatrix/ProjectMatrixPlugin.scala
@@ -0,0 +1,18 @@
+package sbtprojectmatrix
+
+import sbt._
+import java.util.concurrent.atomic.AtomicBoolean
+import scala.language.experimental.macros
+
+object ProjectMatrixPlugin extends AutoPlugin {
+  override val requires = sbt.plugins.CorePlugin
+  override val trigger = allRequirements
+  object autoImport {
+    def projectMatrix: ProjectMatrix = macro ProjectMatrix.projectMatrixMacroImpl
+
+   implicit def matrixClasspathDependency[T](
+      m: T
+   )(implicit ev: T => ProjectMatrixReference): ProjectMatrix.MatrixClasspathDependency =
+     ProjectMatrix.MatrixClasspathDependency(m, None)
+  }
+}
diff --git a/src/sbt-test/projectMatrix/custom/build.sbt b/src/sbt-test/projectMatrix/custom/build.sbt
new file mode 100644
index 000000000..ac0310c4a
--- /dev/null
+++ b/src/sbt-test/projectMatrix/custom/build.sbt
@@ -0,0 +1,34 @@
+ThisBuild / organization := "com.example"
+ThisBuild / version := "0.1.0-SNAPSHOT"
+ThisBuild / publishMavenStyle := true
+
+ThisBuild / ivyPaths := {
+  val base = (ThisBuild / baseDirectory).value
+  IvyPaths(base, Some(base / "ivy-cache"))
+}
+publish / skip := true
+
+lazy val core = (projectMatrix in file("core"))
+  .scalaVersions("2.12.6", "2.11.12")
+  .settings(
+    name := "core",
+    ivyPaths := (ThisBuild / ivyPaths).value
+  )
+  .custom(
+    idSuffix = "config1_2_",
+    directorySuffix = "-config1.2",
+    scalaVersions = Nil,
+    _.settings(
+      moduleName := name.value + "_config1.2",
+      libraryDependencies += "com.typesafe" % "config" % "1.2.1"
+    )
+  )
+  .custom(
+    idSuffix = "config1_3_",
+    directorySuffix = "-config1.3",
+    scalaVersions = Nil,
+    _.settings(
+      moduleName := name.value + "_config1.3",
+      libraryDependencies += "com.typesafe" % "config" % "1.3.3"
+    )
+  )
diff --git a/src/sbt-test/projectMatrix/custom/project/plugins.sbt b/src/sbt-test/projectMatrix/custom/project/plugins.sbt
new file mode 100644
index 000000000..4e80bbafc
--- /dev/null
+++ b/src/sbt-test/projectMatrix/custom/project/plugins.sbt
@@ -0,0 +1,5 @@
+sys.props.get("plugin.version") match {
+  case Some(x) => addSbtPlugin("com.eed3si9n" % "sbt-projectmatrix" % x)
+  case _ => sys.error("""|The system property 'plugin.version' is not defined.
+                         |Specify this property using the scriptedLaunchOpts -D.""".stripMargin)
+}
diff --git a/src/sbt-test/projectMatrix/custom/test b/src/sbt-test/projectMatrix/custom/test
new file mode 100644
index 000000000..e1b9b9ed6
--- /dev/null
+++ b/src/sbt-test/projectMatrix/custom/test
@@ -0,0 +1,6 @@
+> publishLocal
+
+$ exists ivy-cache/local/com.example/core_config1.2_2.11/0.1.0-SNAPSHOT/poms/core_config1.2_2.11.pom
+$ exists ivy-cache/local/com.example/core_config1.2_2.12/0.1.0-SNAPSHOT/poms/core_config1.2_2.12.pom
+$ exists ivy-cache/local/com.example/core_config1.3_2.11/0.1.0-SNAPSHOT/poms/core_config1.3_2.11.pom
+$ exists ivy-cache/local/com.example/core_config1.3_2.12/0.1.0-SNAPSHOT/poms/core_config1.3_2.12.pom
diff --git a/src/sbt-test/projectMatrix/jvm/build.sbt b/src/sbt-test/projectMatrix/jvm/build.sbt
new file mode 100644
index 000000000..19a0b6165
--- /dev/null
+++ b/src/sbt-test/projectMatrix/jvm/build.sbt
@@ -0,0 +1,19 @@
+// lazy val root = (project in file("."))
+//   .aggregate(core.projectRefs ++ app.projectRefs: _*)
+//   .settings(
+//   )
+
+lazy val core = (projectMatrix in file("core"))
+  .scalaVersions("2.12.6", "2.11.12")
+  .settings(
+    name := "core"
+  )
+  .jvmPlatform()
+
+lazy val app = (projectMatrix in file("app"))
+  .dependsOn(core)
+  .scalaVersions("2.12.6")
+  .settings(
+    name := "app"
+  )
+  .jvmPlatform()
diff --git a/src/sbt-test/projectMatrix/jvm/core/src/main/scala/Core.scala b/src/sbt-test/projectMatrix/jvm/core/src/main/scala/Core.scala
new file mode 100644
index 000000000..274e01225
--- /dev/null
+++ b/src/sbt-test/projectMatrix/jvm/core/src/main/scala/Core.scala
@@ -0,0 +1,6 @@
+package a
+
+class Core {
+}
+
+object Core extends Core
diff --git a/src/sbt-test/projectMatrix/jvm/project/plugins.sbt b/src/sbt-test/projectMatrix/jvm/project/plugins.sbt
new file mode 100644
index 000000000..4e80bbafc
--- /dev/null
+++ b/src/sbt-test/projectMatrix/jvm/project/plugins.sbt
@@ -0,0 +1,5 @@
+sys.props.get("plugin.version") match {
+  case Some(x) => addSbtPlugin("com.eed3si9n" % "sbt-projectmatrix" % x)
+  case _ => sys.error("""|The system property 'plugin.version' is not defined.
+                         |Specify this property using the scriptedLaunchOpts -D.""".stripMargin)
+}
diff --git a/src/sbt-test/projectMatrix/jvm/test b/src/sbt-test/projectMatrix/jvm/test
new file mode 100644
index 000000000..9873bfe86
--- /dev/null
+++ b/src/sbt-test/projectMatrix/jvm/test
@@ -0,0 +1,4 @@
+> compile
+
+$ exists core/target/jvm-2.12/classes/a/Core.class
+$ exists core/target/jvm-2.11/classes/a/Core.class