[Groxx]

Yes, but covering all the important parts exceeds the "couple sentences / one short paragraph" goal. First and foremost it's a DB + server + client libs (I entirely agree on that one, it's a major value-prop). Details beyond that are many.

Other important parts may include "runs on node.js", "server code in JS", "client + server define ACL per row", "push notifications", "amazingly, supports windows mobile", etc, depending on the viewer. That's what the rest of the documentation is for, e.g. in a features list.