Somewhat related, I've had an ambition for a while to contribute to a widely used library like zlib or OpenSSL, purely so that I could claim I had written code used in Windows or on my friend's mobile phone.
I am yet to contribute to either project, but I did successfully get in a patch to PHP which removed logo GUIDs for good, which means once PHP 5.5 is out, I can claim that a lot of internet websites use my code :D
10 years ago, while at university, me and 2 other guys implemented a new network protocol (dccp) in the FreeBSD kernel. Later, someone ported it to Linux and gave us some credits.
It's a crazy thing to think about. I've always had the same dream of having written something everybody uses.
My "claim to fame" (which puts a smile on my face when I think about it) is to have written one of the advertising SDKs that pretty much every mobile game uses, and having it shipped to something like half a billion devices. Yay :).
I am yet to contribute to either project, but I did successfully get in a patch to PHP which removed logo GUIDs for good, which means once PHP 5.5 is out, I can claim that a lot of internet websites use my code :D