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I find it interesting that C/C++ is as high as it is. Python has also had an uptick this year. I’ve seen a few people on this subreddit mention cocotb. I could see that being useful for my current project to visualize data coming from FIR filters.
You can get the toolchain up and running with summon-fpga-tools.
The original PNR used with icestorm was arachne-pnr, but it's being replaced by... nextpnr.
I'd recommend looking at fusesoc to automate flows: https://github.com/olofk/fusesoc