Evefit.org
Welcome to evefit.org, the umbrella site of several projects.
Pyfa
Pyfa is an advanced fitting tool available on all platforms.
Aurora
Aurora is a web-based fitting tool usable in any browser, including the ingame browser. It is currently NOT release-ready.
Eos
Eos is the calculation engine powering both fitting tools, it's available under the LGPL and written in python.