I have used this for a few things. One of them that was the most interesting to code, even though very narrowly useful, was a way to compare two memory dumps from a C++ game to find the objects that don't match (after the game detects a checksum mismatch between online players, the players are asked to make these dumps, and then submit them to us; We drag'n'drop two dumps into a webpage and get a printout of objects that don't match). Admittedly a C++ app would have been a lot faster, but Chrome still managed to read the dumps and extract the relevant info in several seconds.