OOoLilyPond is an OpenOffice.org marco. It helps including music notation in OpenOffice.org Writer and Impress documents. The music expressions are entered as text codes and translated to images (png or eps) using LilyPond.
March 2015: On OpenOffice 220.127.116.11 (Linux), this works. The caveat is that the installer does not work. The libraries are stable, though, and integrates well with Lilypond 2.18.2 (current stable).