FPGA development has long been much more difficult than microcontroller and GAL development due to the lack of open-source tooling. In recent years, some open-source programming tools have been developed for Lattice. So, how are the supported platforms going today? Very much it’s still just Lattice, though word is out about a Xilinx reverse engineering effort that is getting further along.
20201126/https://www.ktemkin.com/exploring-open-fpga-hardware/