ViperData log viewer and analysis tool
 

My tuner has been working on a pretty sweet datalog analysis program, I find it a lot easier (and faster!) to use than Excel or Ecutek's built in datalog viewer. It's also a fair bit more powerful than Datazap.

http://s4.postimg.org/qee3zogfx/Overall.png

It makes things like visualizing fuel trims a breeze.

http://s3.postimg.org/r9llevosz/LTRIMS.png

Check it out here http://blog.vittuned.com/viperdata/
Software is free and the user guide is on the same page as the download link.

I used this last week on the dyno to help tune my car (along with Vit himself sitting next to me), this software is definitely badass. Vit hates inefficiency, and when software gets in his way, he just writes his own lol.