GitHub profile link is a phpBB 3.0 modification which adds a new profile field for GitHub. It is displayed on viewtopic, viewprofile, ucp_pm_viewmessage, ucp, acp.
The MODX actions were generated using the MODX generator.
This modification uses UMIL. If you are using the development version, you need to add UMIL manually. The version used can be found in develop/UMIL_VERSION.
For building the MOD package you must use the develop/build.sh script. It will fetch required dependencies such as UMIL and create the package. There is a develop/clean.sh script to clean up the mess.
It is released under the GNU GPLv2.