Like which ones? Honest question.
replyThere aren't any open commercial FPGAs as far as I know. Some have had their bitstream formats reverse engineered though.
replyWe're starting to see open source FPGAs but they are miniscule: https://tinytapeout.com/chips/ttihp26a/tt_um_fabulous_ihp_26...
I think Efinix did something internally, with Yosys.
replyNot many options unfortunately. Today that's GateMate.
replyNext best thing? The mature reverse-engineered families nextpnr[0] supports.
0. https://github.com/YosysHQ/nextpnrhttps://github.com/YosysHQ...
> Not many options unfortunately. Today that's GateMate.
replyAnd that's not a great option, frankly. GateMate is a strange design with major performance issues, like the lack of a dedicated clock network.