Tape It - App for songwriting & audio recording.
Guitarix - Guitarix is a simple Linux Rock Guitar Amplifier for https://alternativeto.
Songcraft.io - A platform for songwriters to write, organize & collaborate.
Rakarrack - Rakarrack is a richly featured multi-effects processor emulating a guitar effects pedalboard.
RiffShare - Write down a musical riff, send to band members, collaborate
ToneLib GFX - The perfect custom tone with a complete guitar studio in your computer