fabu

A music program. Piano roll, instruments, effects, a mixer, and you can make stuff with up to 100 other people at the same time.

https://rquw.github.io/fabu/ (if you think downloading is sketchy (i don't blame you) you can use the web version)

what it does

piano roll, various instruments, and you can build your own instrument out of any audio file
effect lanes with keyframes (automation lanes)
equalizer
record the mic, or record notes live off your keyboard. you can also use a MIDI keyboard but idk if that'll work. i haven't tested it (because i don't own a damn midi keyboard)
multiplayer. same project at the same time. up to 100 concurrent people (could get laggy lol)
saves as .fab, exports wav / mp3 / ogg. you can also export as MIDI or the different stems
automatic updates (may not work on windows. working on it)
a sample (or as it is called in the app, "loops") browser where you can upload your own or use posted samples from others
AND MORE !!!!!!!

MIT, see LICENSE.