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f4pga-arch-defs
FOSS architecture definitions of FPGA hardware useful for doing PnR device generation.
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There are some FPGAs that have been _fully_ reverse engineered and now have open source toolchains, such as Lattice iCE40 and Lattice ECP5(-5G). Others are coming along, such as Xilinx 7 series and Lattice's Nexus FPGAs (CrossLink and Certus products).
See: https://f4pga.org/
As far as boards go, there are many, many out there. Some of my favorites are:
Alchitry Au: https://www.sparkfun.com/products/16527
Olimex iCE40HX8K-EVN: https://www.olimex.com/Products/FPGA/iCE40/iCE40HX8K-EVB/ope...
ECP5-5G evaluation kit: https://www.latticesemi.com/products/developmentboardsandkit...