[progmetaldev]

I used to use this quite a bit after it was introduced, but CHM files are a bit unwieldy for documentation, at least for myself. Having integrated search is nice, but the windowed interface, and being tied to Windows (AFAIK, maybe there are readers for other operating systems) I believe will keep this project from being used. I always found it to be decent for more advanced developers, but felt there was something missing for more junior developers that needed documentation.

[Merad]

I haven't used it in 4-5 years but at the time we were generating html docs with it. IIRC it supports several other output formats.