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)
I would suggest a Confluence alternative: https://archbee.io
Archbee is the documentation app for engineers.
Realtime knowledge base for your team, product docs for your customers.
How is Archbee different? Well, we focus on providing developer teams the best possible experience.
We are not a generic solution, meaning: you'll get a powerful realtime editor with diagramming capabilities,
Swagger, GraphQL, real code editor (Visual Studio Code embedder).
Disclaimer: I am the founder of Archbee
https://archbee.io