Two Important Anniversaries
10 years ago today, Theo de Raadt started the OpenBSD project. 11 years ago today, Larry Wall released Perl 5.005. It would be difficult to overstate their contributions to software development, security, and the Internet in the intervening years. Happy anniversaries!
What's the most important contribution of either project?
10+ years for Perl 5.005. And it's still, for the most part, just as useful and used now. That's pretty impressive for any version of software.