I've wanted something like this for a long time, a little app for drawing graphs. Intended for small graphs where laying things out by hand is not too painful, and it's nice that things don't move around every time I make a change, as happens with graphviz. The file format is still amenable to git like graphviz; no long lines, and adding new nodes or edges doesn't reorder unrelated nodes and edges.

The catch: it's a lot more limited than all these tools; all you can do so far is draw rectangles and edges between them.

Comments gratefully appreciated. Please send them to me by any method of your choice and I'll include them here.