PHP

Preferred license: PHP License
PHP is a widely-used general-purpose scripting language that is especially suited for Web development and can be embedded into HTML. If you are new to PHP and want to get some idea of how it works, try the introductory tutorial. After that, check out the online manual, and the example archive sites and some of the other resources available in the links section.
Actual source code produced by the student participants in Google Summer of Code™ for PHP can be found here.
 
Current Projects
by Hannes Magnusson, mentored by Michael Wallner
by Yiduo Wang, mentored by Fredericus G Rethans
by Adam Harvey, mentored by Fredericus G Rethans
by Konsta Vesterinen, mentored by Lukas Smith
by Mike Lewis, mentored by Sebastian Bergmann
by Igor Feghali, mentored by Helgi Þormar Þorbjörnsson
by Nicolas Bérard-Nault, mentored by David Coallier