I have released a fork (modified version) of the Rosegarden music editor software at:
https://github.com/thanks4opensource/rosegarden-fork
and/or:
https://sourceforge.net/u/thanks4opensr ... evel/tree/
See the the GitHub page for extensive documentation on the changes and additions compared to the official version of Rosegarden. Most are workflow improvements plus extended visualizations in the Matrix Editor (aka "piano roll"), so the fork's enhancements will be of less benefit to those who primarily use the application's Notation Editor, live MIDI and audio recording, or its many other features. But experienced Rosegarden users -- and if you're not one, you should be -- will notice improvements to the Loop and Marker Rulers, and particularly the extended analysis and automatic lead sheet generation capabilities in the Chord Name Ruler.
Note that the fork builds upon and is indebted to literally decades of work by dozens of contributors to Rosegarden. It has had comparatively little testing, very likely contains bugs, and is likewise the sole responsibility of its author. Please report any problems at https://github.com/thanks4opensource/ro ... ork/issues instead of the mainline Rosegarden sites (unless the bug is confirmed to also affect the most recent official version).
There are many open-source sequencing, recording, and notation editing packages available. I think Rosegarden is one of if not the best, particularly with these new improvements. Feedback -- including opinions to the contrary -- and suggestions for further new features are welcome.