add GateMate ILA to alternatives

doc/alternatives.md

@@ -1,4 +1,4 @@
-There's quite a few FPGA debugging tools out there, and it may happen that your needs are better met by another tool. This section aims to provide a list of alternatives, in hopes that you're able to be confident in your debugging flow.
+There's quite a few FPGA debugging tools out there, and it may happen that your needs are better met by another tool! This section aims to provide a list of alternatives, in hopes that you're able to be confident in your debugging flow.
 
 ## Open Source Tools
 
@@ -9,6 +9,12 @@ An embedded logic analyzer written in Migen, primarily for use in LiteX SoC desi
 - [Source Code](https://github.com/enjoy-digital/litescope)
 - [Documentation](https://github.com/enjoy-digital/litex/wiki/Use-LiteScope-To-Debug-A-SoC)
 
+### GateMate ILA
+
+An embedded logic analyzer written in Verilog, targeting the GateMate FPGA family from Colonge Chip and the Yosys/NextPNR toolchain. Communication between the host and FPGA is accomplished with SPI, via a FT232 or FT2232 used as a USB-SPI adapter. GateMate is inteneded to be used with GTKWave, so the tool generates `.gtkw` files in addition to VCD files.
+
+- [Source Code](https://github.com/colognechip/gatemate_ila)
+
 ### ZipCPU Debugger
 
 A set of embedded debugging modules written by Dan Gisselquist of ZipCPU fame. Communication between the host and FPGA is accomplished with UART, and control of the debugger is performed with a C++ API on the host. A wishbone interface is provided on the FPGA side to connect to other Wishbone-based debugging tools that can provide control of user registers, block RAM, and an embedded logic analyzer. Supports dumping of signals to a VCD file.