Andytime is a pretty cute little one. Not too sophisticated though.
I've lost my link, so you'll have to google it. Also look for
Andybase, a really handy base system convertor. For commercial
software, I think Smart Draw might do them (maybe).

Josh
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A common mistake that people make when trying to design something
completely foolproof is to underestimate the ingenuity of complete
fools.
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On 5/16/05, Glenn Jones <lynxlab@gmail.com> wrote:
> I am writing some documentation for one of my projects and I want to
> include a diagram showing some SPI transactions. I'm not trying to
> show the setup and hold times or anything like that, I just want to
> show the general format of the data. However the data is specific to
> this application, so I can't just take an SPI transaction diagram from
> some other datasheet. Does anyone know of any (free) software that
> will easily allow drawing digital waveforms?

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