Repos' Subversion images
First of all, why do we use svn? We see it as a self-hosted blob store with an audit trail. It comes with an HTTP API and has permanent URLs to every revision at every path. It stores binary files efficiently and supports versioned metadata and individual file branching.
For write access REST we use rweb.
Subversion is no longer actively maintained.
We see 1.8.x as latest stable, partly because SvnKit is inn't completely compatible with 1.9.x.
There is a branch
1.9.x for those who are interested in the backend optimizations.
At Repos our source is in git, but we haven't found something better than svn for documents, graphics and configuration.
Our next best bet would be something like IPFS, but we're in no hurry.