There are other applications out there. Drawtiming looks good, but we can’t quite get our head around the file format and the graphic output isn’t as flexible as we’d like: it only outputs GIF and we’re more into SVG because it can be edited easily after the fact.

There are font-based solutions that let you “type” the timing diagrams. We found Xwave and “Timing Diagram Font“. These work but aren’t particularly flexible; if you want something to happen at odd times, you’re out of luck.