I wrote a significant part of Dead Rising 3 (Dead Rising 3 - Wikipedia, the free encyclopedia) that has reportedly sold over 1 million copies.
I've also written a chess analysis bot for FICS (Free Internet Chess Server (FICS)) that has been used by 32,000 unique users according to logs. waterreaction / AnalysisBot — Bitbucket
Not counting small patches to open source programs, mostly because I forgot most of them already.