I was tired of wasting time looking for online tools all the time to pretty print a JSON to inspect it, encode/decode strings, convert from one markup language to another, checking hashes, etc. For some tasks I was usually using the interactive console of some dynamic language such as python or node but it wasn't easy enough.

So I've made a static web page that you can use online or download to your computer with all those tools and much more. Personally I have that as home page in my browser :)