[LambdaB]

Dokuwiki and optionally Mediawiki seem to go a long way in shared environments. For personal use, https://zim-wiki.org is my favorite right now. It uses files as the storage backend and can therefore be tracked and shared via git. Features are extendable via plug-ins.

As others have mentioned, using one single central tool is crucial, even if it is only used for references to external tools (e.g. reference to pads). It should represent the first point of entrance in the search for knowledge in any team.

This also includes the possibility of migration, export, and self-hosting to have full access and backups at any time.

[geppetto]

Dokuwiki is great. Self-hosted, low requirements (no DB, just php), easy to maintanin, plain text files so data always accessible. It's a wiki so easy to edit and publish; readers can register and contribute.