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Pro .NET version
Cruise Control .NET can be used on Windows to build .NET applications, although it is dated by now, it still can be interesting for use on low-spec systems.
Pro Free and open source
Cruise Control is a free and open source project built with Java and hosted on Sourceforge.
Con A bit tricky to set up
CruiseControl may be a bit tricky to set up. However, it has been around for quite a while so it should be pretty easy to find resources to help you out.