The discovery of 1284 new exoplanets made by the Kepler space observatory was confirmed by open source software. Kepler is producing so many exoplanet candidates that astronomers have a hard time confirming them all. How could so many candidates be confirmed in one batch? With new open source software, VESPA, written by Timothy D. Morton. Now we know of more than 3,400 exoplanets.
Princeton University: More than 1,200 new planets confirmed using new technique
Astrobites.org: The gruntwork behind Kepler’s new batch of exoplanets