A Unity plugin which allows you to merge scene and prefab files when using git. More information: http://flashg.github.io/GitMerge-for-Unity/
After five long years, Unity suddenly fixed issue #17 for us. The project is now back to a state full of potential, but it has years of Unity updates to catch up to.
- Merging scene files (although this needs to be refined and thoroughly tested).
- Merging prefabs (but the newer prefab features, nesting and variants, are not explicitly supported yet. There needs to be testing, at least).
Please check the v2.0 milestone for a list of important issues.