Guitarix - Guitarix is a simple Linux Rock Guitar Amplifier for https://alternativeto.
Hum - Songwriting for iPhone
TH-U - World class guitar amps and effects for PC and Mac
Tape It - App for songwriting & audio recording.
Ampire - State Space Modeled guitar amp/cab/stompbox simulator.
Songcraft.io - A platform for songwriters to write, organize & collaborate.