Advance Units Converter based on the linux/unix program "Units" by Adrian Mariano. It supports 2083 units, 71 prefixes, 32 nonlinear units.
Convert units of distance, weight and volume.
Morse Code Converter
The Pool Calculator
The Pool Calculator takes care of all the math that might come up while you are keeping your swimming pool's water chemistry in balance, telling you exactly how much of each chemical to add.