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There's a complete open source toolchain available for ice40 and ecp5 FPGAs from Lattice, for both Verilog and VHDL. I've been using it for almost a year now and it's really good. See github.com/YosysHQ

> Speaking of open source FPGA tools, I recently saw a video on Twitter of someone programming an FPGA (TinyFPGA, I think) using a 100% opensource toolchain. Has anyone seen that?

Could it be https://symbiflow.github.io/? Symbiflow aims to be "gcc for FPGAs".

QuickLogic perhaps; 100% open source FPGA+MCU platform. This is probably the video you're thinking of: https://www.youtube.com/watch?v=Q5GIZUsXb3I

Investigate yosys and nextpnr.

They support several families of FPGAs, to varying extents.

iCE40 was first. Now there's also full stack support for ECP5, QuickLogic (with manufacturer's help!) and a subset of Xilinx family 7 and GW1N (cheap chinese FPGAs!), among others.

there's the Fipsy Fpga project https://www.mocomakers.com/fipsy-fpga/ which started as a kickstarter in 2018