Similar to Joomla!

OpenEmbedded

OpenJPEG

OpenSC

OpenSSH

OpenSSL

OpenVanilla

Open Source Geospatial Foundation

Pango

PCMan File Manager

PDF.js

Eudora OSE

Perl Compatible Regular Expressions

Phonon (software)

Pico (text editor)

Pidgin (software)

KDE Plasma

Poppler (software)

PostGIS

Premake

Psyco

Puma (web server)