ZBrad
I needed a lexer that outputs C# code, so I did a quick google search. Cool, a co-worker of mine wrote one. It works great. I needed to make the lexer recursively call itself to do some hierarchical parsing, but it was easy since all of the rules are executed as C# code. Even cooler, when I did a google for “zbrad” to find the hyperlink again, I found that he was checking code into the PDP-10 source tree back when I was 11 years old.