Aequatio is a simple math tool, that helps you to calculate your estimations.
“Aequatio” itself is a latin word and it means “equation”, so Aequatio tries to follow meaning of its name.
Aequatio is open source software, it’s distributed under the terms of BSD License.
You can see source files here. Also you can get install packages for Linux (Ubuntu, Arch), Windows and Mac OS X here.