2016 Update
Well, computers, you can bet that everything has changed here.
There are a number of computer software packages available that allow you to simulate different dive profiles and create custom decompression tables without actually going in the water. Most of them have graphical interfaces, and allow you to vary not only the dive profile, but gas mixes, decompression mixes, decompression stops, algorithm, conservatism, and many other factors. Software like this is a staple in the technical diving field but is also useful to the recreational diver. Here are a couple, with links:
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