Information for developers
Start reading the Development page.
Read the DevelopersFAQ and the ModularDevelopersGuide.
Read the ToDo, and add to it if you think it's lacking.
RepoPolicy covers the general commit rules.
CodingStyle gives a guideline for the general coding style in X.
XorgTriage outlines our bugzilla workflow.
X.Org Foundation Workgroups
Source Code
Virtually all the source code of the server, the drivers and the default applications is hosted on the git server of freedesktop.org. It can be browsed on-line via the cgit interface. For more details, refer to the UsingGit page.
Specifications and reference manuals
A lot of specifications can be found in the git tree, in doc/xorg-docs. Short documents are in plain text format, while bigger ones tends to be in troff or DocBook format, and will therefore need to be compiled to be read easily.
The documentation of each component is gradually split out into their respective modules. In particular:
You might also be interested by the list of specifications available at freedesktop.org.
Fixing bugs
Bugs assigned to the freedesktop bugzilla pseudo-user xorg-team@lists.x.org need someone to take ownership of them. If you feel qualified to fix the bug, feel free to take ownership of the bug by reassigning it to yourself.
Submitting patches
Attach your patches to a bug on freedesktop bugzilla. You can also submit your patches to the appropriate XorgMailingLists for additional review.
Requesting features
Please remember that X is just one component of the overall free desktop and that therefore future X enhancements should be thought through with this perspective. Also remember that the folks here are massively overloaded---by far the most reliable way to get a feature in is to put it there yourself.
To Do
See the ToDo page for a list of tasks that need to be done specific to Xorg. A more comprehensive list of unfinished X related projects (not necessarily involving working on the server itself) is also available. Both of these lists may be a bit out-of-date, so do hit the email lists once you've gotten yourself oriented.