Elektroid is a sample and MIDI device manager. It includes the elektroid GUI application and the elektroid-cli CLI application.

Elektroid est un gestionnaire d'échantillons et de périphériques MIDI. Il comprend l'application GUI elektroid et l'application CLI elektroid-cli.

Cacophony is a minimalist and ergonomic MIDI sequencer. It's minimalist in that it doesn't have a lot of functionality MIDI sequencers have. It's ergonomic in that there is no mouse input and a very clean interface, allowing you to juggle less inputs and avoid awkward mouse motions.

Cacophony is open source. You can buy it, or you can compile it for free.

Note names, MIDI numbers and frequencies are related here in tables and via an application that converts them. The musical interval between two notes depends on the ratio of their frequencies. See Frequency and Pitch for more details and an introduction to frequency and pitch.
Les noms de notes, les numéros MIDI et les fréquences sont ici liés dans des tableaux et via une application qui les convertit. L'intervalle musical entre deux notes dépend du rapport de leurs fréquences. Voir Fréquence et hauteur pour plus de détails et une introduction à la fréquence et à la hauteur.