Which service to choose for knowledge sharing within the company?

Question

Work organization

Good afternoon.
There is the following problem.
Within the framework of the company, it is necessary to organize a platform (blog / chat / service) for the possibility of sharing knowledge between employees. The specifics of the company is such that there are a large number of projects and not all people are aware of who and what is doing on other projects and what problems they solve.
Ideally, I would like to have the following features
1) Integration with source code (gitlab / upsource)
2) The ability to write small articles from the problem / solution series interspersed with formatted code
3) Binding to tags
4) Somehow to organize a chat between employees
Was under consideration a bunch of Slack + GitLab/UpSource
but slack is expensive for business users, given our number of employees.
Who has any ideas?
Thank you very much for your reply.

Answer 1

Bitrix24, Papyrus