Dat is an open source project focusing on data storage. In particular, the project wants to version control data. What is version control? In short it allows for tracking of history associated with something (typically source code files or documents). Dat takes the idea a bit further, and the data is versioned at the row level and not the file level. Plus, it is built for collaboration among teams.
Use the online tutorial to learn more.
Dat is currently in beta. This is going to be a very interesting project to watch. I can see many great use cases.