I’m vaguely interested. IDK that I have loads of time to spare, but I’m an experienced software dev who knows how to make the magic that is required for a lot of different kinds of games. I could at least advise. I’m kindof curious what your vision for this organization is. Are you looking for founders for a company? Are you just looking to have a group project that makes something cool? To what degree do you expect money to be involved?
I actually recently just did research on this for my own purposes.
Those are the FLOSS options that I know about. There may be others, I didn’t really look at them. They would be even less popular than the ones that I’ve listed above.
In the end, I chose REAPER. It’s not free, but the trial period is effectively indefinite (the software does not cripple itself after the 60 day period officially passes). The personal license is quite reasonably-priced ($60 USD), and the commercial one ($225 USD) is still not too bad if you want to use it professionally. It’s a one-time purchase. You don’t need new licenses for updates. It’s Linux-native, and it does all the things.
As far as plugins go, the FLOSS software has got you covered. Zynaddsubfx is kindof famous, and Cardinal is a really good modular synth (inspired by VCV rack, which is also free and available). Vital is also quite reputable. There’s a whole pile of things available: https://wiki.archlinux.org/title/List_of_applications/Multimedia#Audio_synthesis_environments
As far as installation goes, all of this is available from either extra or the AUR.