Little Pork Chop alternatives

It's ironic to see so many people on Twitter hate on Twitter. It has its problems, but it's still the best place to build a network and learn from smart folks (at least in tech) if used well.

I use Gitbook to write a user manual for one product. All in all, I like that they develop and introduce new visuals and features to it, but I don't like that it's not a light-weight solution at all...