See https://github.com/cjbarber/hipchat-alternatives for more ideas.
Besides a gazillion open source wiki projects…
For a bigger far more all encompassing documentation toolchain:
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Jive Disclosure: former employer (but thoroughly recommend for the right culture/environment)
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Salesforce.com’s Chatter Disclosure: former employer (don’t recommend based on user experience 3+ years ago)
@scottwarren I'm using notion right now, the best Wiki App so far. But the pricing is terrible: 8$ per user and month from the beginning on. Other SaaS products like Confluence (10 users for 10$), Git, Bitbucket, etc. offer a staggered pricing.
If you are evaluating an idea in a team you are screwed after a few weeks because you reach the limit of 1000 blocks and have to pay (in our case) 48$ a month for something that is slightly better than confluence without any option of self hosting.