Never mind the big shots. I estimate I have put about 100 hours this year into development, distribution, promotion, and documentation of open source software for optimization (coin-or.org), which benefits me directly. Multiply that by 60 (we have thousands of downloads) and there's your 3 man years (6000 hours). That arithmetic doesn't even count people whose primary job really is to support one of our packages so that IBM or SAS can use it to support their customers. One more thing: I have submitted many detailed bug reports this year. Openoffice, htlatex, lyx, etc. Not a single bug report for commercial software. BTW, does anyone even know on which Deep Blue the bugzilla for Windows Vista runs?