The information in this wiki hasn't been maintained for a good while. Some of the projects described have since been deprecated.
In particular, the "Ushahidi Platform v3.x" section contains information that is often misleading. Many details about this version of Platform have changed since.
This website is an extraction of the original Ushahidi wiki into a static form. Because of that, functions like logging in, commenting or searching will not work.
For more documentation, please refer to https://docs.ushahidi.com
Mapping Information for crisis or emergency response is one of the best known uses of Ushahidi and Crowdmap. Inspired by the Haiti response map, individuals and organizations including volunteer technology communities have responded with a maps around the world. There are also preparedness maps and simulation projects.
Some articles and presentations: