Uki is the Ujap wiki
Uki is programmed in php. It is very simple in all aspects:
- source code
- installation procedure and configuration
- writing text and editing pages
The simplicity of the source code means that it does not offer too many features, but in spite of that it's quite useful.
Until I write a nice description of all features, take a look at the FeatureRequests and look for the Done section.
There are several pages of documentation available: