I would say if you have the money for it, the Icebreaker FPGA dev board is really nice and integrates with the open source tools well. When prototyping I either

I would say if you have the money for it, the Icebreaker FPGA dev board is really nice and integrates with the open source tools well. When prototyping I either use Verilog + Iverilog for simulation + yosys and icestrom tools for building, or more recently, I've been messing around with the active nmigen fork for python and doing design and simulation all in there which also links to the other tools for build as well. Honestly what software you like just depends on what you find best.