Nurpawiki is a personal information manager (PIM) application that combines a wiki, a to-do list and a simple scheduler to help you get organized. It aims to ease note taking and action planning. Actions (to-dos) are always associated with notes or plans (wiki pages).
Read about its history.
Nurpawiki currently being extended to support multiple users in order to help organize small team development.
The application is written in OCaml and uses the fantastic Ocsigen web programming framework. It runs in a web server and uses SQL for persistence. It can thus be hosted on Linux and used on on Windows or any other web browser capable platform.
More details at DeveloperPage