A Trac plugin to create Test Cases, organize them in catalogs and track their execution status and outcome.
Take a look at the Web Page on trac-hacks:
Love it, great tool!
Great addition for any trac-based team. Reliable, simple, configurable. seccanj is a very active and communicative 1-person OSS developer.
This has started as a small project, but now comprises some rich set of features and is under active development. If you need a lightweight yet powerful Web environment to manage at the same time Test artifacts as well as code and bugs, Trac plus the TestManager plugin is worth trying.