| Class | GitRefMixin | Methods and properties common to GitRef and GitRefFrozen. |
| Class | GitRef | See IGitRef. |
| Class | GitRefDatabaseBackedMixin | A mixin for virtual Git references backed by a database record. |
| Class | GitRefDefault | A reference to the default branch in a Git repository. |
| Class | GitRefFrozen | A frozen Git reference. |
| Class | GitRefRemote | A reference in a remotely-hosted Git repository. |
| Function | _fetch_blob_from_github | Undocumented |
| Function | _fetch_blob_from_launchpad | Undocumented |