xs: a dynamically typed, dynamically scoped, concatenative array language inspired by kdb+/q and released into the public domain. The interpreter and builtin functions are written in OCaml.
stag: a public domain ncurses based audio file tagger. Both very fast and very nice to use!
morg: public domain command-line music organizer. Renames and sorts files based on their tags.
metaswarm: a BitTorrent client written in Scala. Many of the libraries it uses are no longer updated for Scala 2.13 (much less Scala 3). As such, the client is no longer maintained.