Git dominates the version control space for developers. But there are alternatives. For example, Mercurial is as old as Git (both were created in 2005). Another alternative is Fossil, created by Richard Hipp (the author of SQLite).
Here is a list of version control systems on Wikipedia. There are a lot more than I realised:
https://en.wikipedia.org/wiki/Comparison_of_version-control_software
Are you using an alternative to Git? What are your reasons for choosing an alternative? What do you like (or dislike) about the alternative you're using? And would you recommend it?