One website for support tickets, documentation, user management, file transfer, etc

Does anyone know of a web app that can do all of the above in one place? We are currently working with Vtiger (support), Confluence (documentation), Joomla (website, user management & custom file transfer area).

We've tried using various Joomla components, but we've fo开发者_开发问答und nothing as good as the individual web apps listed above... We need something really robust & easy to use. And something that can be controlled with varying group permissions.

Cheers :)

I personally use Redmine for all of the mentioned needs.