A freeware modular music editor
Ranked in these QuestionsQuestion Ranking
Pro Lots of plugins
It supports its own plugin format, and there are a lot of community-created plugins.
Pro It is free
You get the full functionality for free
Pro VST support
VST is supported via a special plugin.
Con Windows only
Rumors are, it can be launched with wine on Linux
Con Not a complete DAW solution
It lacks some typical DAW functionality, although with some trickery you can do anything.