20.04 - How do I use my MIDI keyboard with Ubuntu? - Ask Ubuntu
Playmidi download | SourceForge.net
Serenade - Karaoke editor and player
notation software - Free MIDI player
Qtractor - An Audio/MIDI multi-track sequencer
How can a newb like myself get my midi piano working with Linux? - LinuxMusicians
PianoBooster
Play a digital orchestra with Linux Sampler | Opensource.com
Drumstick Multiplatform MIDI FIle Player
MusE - MIDI/Audio sequencer - LinuxLinks
SMS (Simple MIDI-Audio Sequencer) built with Purr Data / Pd-L2Ork (Pd engine) – LINUX ♥ ROUEN ♥ Normandie | Libriste ♥ seinomarin (76)
Play Midis on Linux / Make Linux MIDI Ready for the Future - Enable embedded MIDI music to play in a Browser, Play MIDIs with VLC and howto enjoy Midis in Text
Widi(MIDI player for Advanced Linux Sound Architecture/Open Sound System)
Make MIDI loops on Linux with this open source tool | Opensource.com