Helio Workstation
(in development/unstable)(GNU GPL v3)
Helio Workstation is free and open-source music sequencer, designed to be used on all major platforms.
Why another sequencer?
Most of the DAW interfaces often seem overcomplicated, and they only tend to get more and more bloated over time. Many of them are commercial, proprietary-licensed and almost none of them support all major operating systems at the same time.
Helio is an attempt to rethink a music sequencer to create a tool that feels right.
It aims to be a modern music creation software, featuring linear-based/pattern-based sequencer with clean UI, integrated version control for synchronizing project between devices, translations to many languages, small portable builds and more; mainly targeted at hobbyist composers, game developers and indie artists.
Give it a try