I would like to ask for a recommendation of an online platform that could be used as an internal knowledge base for specific topics

Ex:

Today I've worked in project X, so I add to the base the project X, material associated with it and references to these materials.

Tomorrow, somebody can perform a search in this base and find (if related) my project or materials related to it.

If possible, I would like to such a platform to be easy insert and search for data.

Thanks.