Ask HN: What do you use for internal wiki?

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I like the company wiki, but which ones are currently 'hot'?

Do you use a:

* self hosted product (mediawiki, tikiwiki, docuwiki),

* as a service (wikihost.com),

* part of a larger product (atlassian, trac, redmine)

* part of a larger service (github), or

* something else maybe?

If you can also explain something noteworthy (good/bad) about your wiki that'd be nice as well..