AstroSPACES is the world's first open source PHP social networking solution.
AstroSPACES project is the world's first open source PHP social networking solution. While there are forks off AstroSPACES -- PHP-Spacester being the most popular -- AstroSPACES is still the leader in PHP social networking.
Designed to use the Smarty Template Engine, AstroSPACES is easily templatable. It features image galleries, private messaging, comments, and more. It is in active development, with a new release every few days.