XWiki is not just a wiki, it is a extensible development platform to build online collaborative tools. But you don't need to be a developer to start using it, and even to develop small applications. And best of all, it is open source and therefore freely accessible. With tons of extensions and growing, you can customize XWiki to really match your specific needs. We use it to create public WebSite that display business information, and we provide the backend to manage the data on the exact same platform. One tool for managing, organising collaborating and sharing information. Compare to other collaborative platform, we have chosen XWiki because it is open source, and it provide full flexibility. Seeing some of our work, you cannot easily know that XWiki is behind, so much it has been customised.
The default UI still needs to be improved for better usability. Newcomers are sometime lost by the powerful features proposed, and developers by the myriad of API available. While you have the feeling that there is real intend to create the best collaboration tool, you sometime feel frustrated by some unexpected behaviours. This is probably the price for getting a tool that smart and very customisable.
If you have information to organise and share, you should consider using XWiki in replacement to mail, office, and other complex workflow you are using today.
We provide collaborative online solution to our clients. We have therefore use XWiki as a base platform. Out of the box, it already provides useful feature to our customers, and it allow us to quickly craft a PoC to convince them to go further. By its customisability and the access to the source, we never reach a dead end and we are always able to provide a good solution for our customers needs.