What's the best program you have ever made?

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Originally posted by adrianxw
An inter-process/inter-processor communications library that allowed a non technical programmer to easily communicate with other programs running on the same or other, (VAX), machines in a DECNet network. It allowed spare capacity on standby machines to be used by overloaded duty machines. Written in FORTRAN 77.

Saved a fortune in machine upgrades over the years.

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Suddenly, I'm feeling so stupid :(

Dynamically sizable shared memory library. Written in C++ (ansi / posix) on UNIX (IRIX 6.5). Have tested it on Solaris and Linux also. Only took a week to write, but provided a nice solution to a problem.