Adam Spiers has built a web site which uses LilyPond to dynamically generate images of chords and scales called <a href="http://scalematcher.adamspiers.org/">Scale matcher</a>.
Ben Lemon has created some LilyPond tutorials on YouTube. Read about them on his <a href="https://benl.xyz/lilypond/operation-lilypond/">blog</a>.
Server Acim, composer and professor of Composition and Conducting in İnönü University - Malatya, Turkey, wrote the Turkish Ebook <a href="https://acimanasayfa.wordpress.com/acik-kitap/"> "GNU/LilyPond, Özgür Bir Nota Yazma Programı"</a>.