4. python-lyA Python package and commandline tool to manipulate LilyPond files
5. snippetsA place to store useful pieces of LilyPond code - custom functions, engravers, hacks, templates, examples etc.
6. musicianshipA growing, online "textbook" for music theory and aural skills
8. English-HymnsPublic Domain English language hymnody, transcribed and engraved in Lilypond
10. lilyglyphsMake LilyPond's notational elements available in Lua- and XeLaTeX
14. ljsLua with C/C++/Java/Javascript syntax
19. nenuvarBaroque music scores, typeset with GNU LilyPond
20. SpontiniA text-combined-with-graphic music editor for creating professional scores with LilyPond
21. musicRepository of scores typeset using Lilypond & Ripple