in reply to Protect source code
Here is a fairly complete list that I gathered by using Super Search for 'protect source code'. Remember that using Super Search is quicker than posting a question and waiting for the replies.
Would you look at that? This question has been asked over and over and over.
Don't forget my favorite: Here is a commercial obfuscator!
Conway's Game of Life
Perl regular expressions
My Magic 8-Ball™
Results (186 votes). Check out past polls.