Apache Continuum
Continuum is a great partner to Apache Maven which will run builds on a configurable schedule. Much like Cruise Control, Continuum will email developers when the build is broken requesting that the culprit fix the problem. You may add a project to Continuum simply by pointing to the pom.xml in the source control system and it will magically do the rest (check out from source control, run a clean build, deploy to the integration server and run unit tests).
Continuum is a nice implementation of a web application and is very easy to setup. Unlike its close relative Maven, continuum is fairly well documented and self-explanatory.