At every point everyone had a need to compare two texts to spot the differences between them.
In my case I wanted to compare two csv files. There are a lot of options how to perform this. But I wanted to be online.
So I've found jsdifflib. Small JS lib that do the job.
I've took the demo page (with very small changes) and package it as Chrome App, which can be used offline.
You can get the app from here
And thanks to cemerik for the lib!
Hope you like it!