Infinitest was just recommended by Neal Ford from ThoughtWorks, for projects doing Continuous Delivery:
Infinitest is a Continuous Testing plugin for Eclipse and IntelliJ. Each time a change is made on the source code, Infinitest runs all the tests that might fail because of these changes.
Details: http://infinitest.github.io/
Has anyone here tried it? Any feedback? (If not, does anyone want to check it out?)