This is Wikipedia's tip library. Here you can digest how to use Wikipedia in bite-sized morsels. The tips listed below were created for the Tip of the day project, but are listed here by title and organized by subject area for your convenience.
MediaWiki is opensource and is available for download for free. You can use it for offline access to the Wikipedia database, or to set up a wiki of your own.
However, MediaWiki requires other software to be able to run. The prerequisite programs are Apache/IIS, MySQL4 or later (5 or later as of version 1.19) and PHP5. When bundled together, these are referred to as AMP. They are also open source and free.