The [http://github.com/gramps-project/addons-source addons-source] repository holds the source code for the addons with branches holding the version for different gramps. If you are working on an addon for gramps for the current Gramps {{man version}} public release, be sure to use the maintenance/gramps51 git branch, as the default is master branch for the developmental pre-release. (Currently gramps 5.2, which is not the typical target for addons.)  Example commands are shown below referring to the public release rather than the master branch. The developers are currently merging changes to the most recent maintenance branch into master as necessary, so you don't have to do anything for that unless you are in a hurry.  The [http://github.com/gramps-project/addons-source addons-source] git repository has the following structure, with the code for each addon in its own folder:

The [http://github.com/gramps-project/addons addons] git repository holds built versions of the addons for each release of Gramps, and has the following structure:

To switch to a local copy of the gramps51 maintenance branch: