multitrack - Robuta Search

https://play.google.com/store/apps/details?id=com.jaytronix.multitracker&hl=en_US&gl=US

Record and edit your song ideas and demos.

https://tuxguitar.informer.com/

TuxGuitar (tuxguitar.exe). With TuxGuitar, you will be able to compose music using the following features: tablature editor, Score Viewer...

https://hackaday.com/tag/multitrack-recorder/

https://github.com/magenta/mt3

MT3: Multi-Task Multitrack Music Transcription. Contribute to magenta/mt3 development by creating an account on GitHub.

https://multitrack-maze.blogspot.com/p/about.html

Mazes of all kinds: Easy and difficult, simple and complicated. for all ages. Multitrack mazes.

https://multitrack.es/