Open Source font development efforts

DejaVu – extension of bitstream Vera to cyrillic & greek and other alphabets.
Free UCS Outline Fonts – A set of free OpenType fonts covering ISO 10646/Unicode character set..
Computer Modern Unicode– Outline based version of Knuth’s TeX fonts, extended to unicode.
JUnicode – A free (GPL) font especially for scholars working with European medieval texts
TypeForge – a site for collaborative font development.
Linux Libertine– A replacement for the Times font family
Open Font Library– Collecting libre/open fonts in one place for easy use