It's got commits from 2 months ago, I keep a few projects that go a few months at a time without activity. I wouldn't say it's abandoned, though maybe the devs aren't finding the time for it (or they're preparing some big update that isn't quite ready yet).
No it's not. Maybe the development is bit slow, because it's not funded by big players. Didn't tried nightly builds, but there is some prerelease available:
In fact these docs are out of date and now even more boards are supported.
You can find the list directly in icestudio menu. If you want to check it beforehand without installing icestudio, i think it's possible to see the list here in source code:
Based purely on the name and a super quick scroll through the github page, it's probably the Lattice ice-series of chips, even more probably the ice40. There are a couple boards with ice40 chips out there that you can use fully OSS tooling for from synthesis to PnR to programming.
There is list of supported boards in menu. "Ice" in Icestudio was originaly for (Latt)ICE or ICE(40) i guess.
But since the F4PGA (formerly known as Symbiflow) is opensource project used to abstract away various FPGA makes (just like gcc and llvm support different CPU architectures). It is quite possible to support more than that. For example right now there is guy working on integrating Apicula project to add support for Gowin FPGA based boards which are extremely cheap:
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[ 3.3 ms ] story [ 33.1 ms ] threadhttps://github.com/FPGAwars/icestudio/releases
https://icestudio.readthedocs.io/en/latest/
https://github.com/FPGAwars/icestudio/tree/develop/app/resou...
But since the F4PGA (formerly known as Symbiflow) is opensource project used to abstract away various FPGA makes (just like gcc and llvm support different CPU architectures). It is quite possible to support more than that. For example right now there is guy working on integrating Apicula project to add support for Gowin FPGA based boards which are extremely cheap:
https://github.com/FPGAwars/icestudio/issues/645