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I had fun playing with the Lattice ICE40 Ultra Plus Breakout board.

I wouldn't call it expensive (~$60) and it's pretty simple.

The toolchain by Lattice however is not the best

nMigen supports the Lattice ICE40. However, instead of writing you Verilog/VHDL, you write Python that generates the Verilog.

nMigen still requires toolchains, perhaps you mean that iCE40 is just supported by Yosys+nextpnr?

I’m assuming one would use nMigen with Yosys instead of Lattice’s bloated toolchain. That wasn’t clear.

iCE40 and/or ecp5, with yosys+nextpnr, is absolutely the way to go.