Git X-Modules is a new product by TMate Software. We call it "Submodules – done right".
Have you ever been struggling with code spread between several repositories?
If yes, then you probably know, how troublesome the native Git Submodules could be. There a few alternatives, but none of them removes the burden from the end user completely or is a fully supported commercial product.
We used our repository mirror technology, perfected by SubGit and SVN Mirror, to create a new solution for this case - totally server-side.
Git X-Modules exists as an app for Atlassian Bitbucket Server / Data Center, and as a free Open Source command-line tool.
Dedicated plugins for GitLab and other Git servers are coming soon!