If you’d like to browse the WordPress source and inline documentation, we have a convenient developer reference and a code browser. We also have guides for contributing with Subversion and contributing with Git.
The built WordPress source, licensed under the GNU General Public License version 2 (or later), resides in a Subversion repository at core.svn.wordpress.org. It is also mirrored to a Git repository at
The source code for any program binaries or minified external scripts that are included with WordPress can be freely obtained from our sources repository.