What are some alternatives?
When comparing Qtractor and Helio Workstation, you can also consider the following products
Ardour - Record, edit, and mix on Linux, Mac OS X, and Windows.
Odesi - ODESI is a music sketchpad that exports your projects to Audio and MIDI.
LMMS - Make music with a free, cross-platform tool
Captain Chords - Write chord progressions in your favorite DAW
FL Studio - Image-Line's FL Studio, now on it's 12th version, is a well-known music production suite and the most popular beat processor on the market, due no doubt to its longevity. Read more about FL Studio.
Liquid Music - Powerful music composition plugin to help instantly produce original song ideas.