Jenkins is also open source, in very active development, and has a strong community of developers and contributors. Because Jenkins is a fork of Hudson, the interface is similar, and much of the core code remains the same (although Hudson 3.0 has some significant changes). Without going too far into the debate (you can read more about it from the Jenkins team and the Hudson team), it comes down to what your dev environment looks like. If you’re in an Oracle-heavy company, Hudson may work best for you. If you’re not, consider Jenkins. Jenkins seems to have more active dev going on right now. Both solutions are integrated with Eclipse and are heavily Java oriented (although not to the exclusion of other technologies).