Open-sourcing OvertureJS – the JavaScript lib that powers FastMail
I've been pushing for this to be done for a while :)<p>There's no point open-sourcing the crappy old parts of our architecture which we wouldn't advise new projects to use (like our Perl framework.  There are so many Perl frameworks these days, and many of them better than ours) - but Overture is high quality stuff.  Enjoy!