Soft
New Head-Fier
Sonarworks is a great starting point. However, they are technically charging money for something you can do for free with enough research and effort. Some of the parametric EQ settings have been shared (if you care to look for them) so you can copy their presets for certain headphones. (I verified that they sound the same.) You could try the free trial to see if you like it. Their compensation curve is proprietary as well. The diffuse field and Harman curves have a more established history.
Here are some threads to start you off on your EQ journey.
http://www.head-fi.org/t/796791/the...ve-the-most-ideal-sound-for-non-professionals
http://www.head-fi.org/t/794467/how-to-equalize-your-headphones-2016-update
http://www.head-fi.org/t/615417/how-to-equalize-your-headphones-advanced-tutorial-in-progress
http://www.head-fi.org/t/587703/how-to-equalize-your-headphones-a-tutorial-part-2
http://www.head-fi.org/t/413900/how-to-equalize-your-headphones-a-tutorial
Personally, I use VST parametric equalizers in foobar2000. Here's some free software for that. (The expensive equalizers are nicer, but unnecessary.)
http://www.rs-met.com/freebies.html
http://www.yohng.com/software/foobarvst.html
Wow thank you, this is so awesome!! Great information, I need to get started reading