Recommended open source knowledge base?

Hello networking peeps!

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Can you please recommend to me any open source knowledge based platform that can be installed on-prem? Would be better if you can share to me your experience with it

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Currently on my list would be:

- Wordpress with WIKI theme (last option)

- Confluence

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P.S I work in an ISP environment so a knowledge base with built-in diagram/map tools would be ideal.

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Thanks!