The latest version of Google Chrome Dictionary extension supports translation as well. In the previous version, you could just double click any word and a bubble would pop up showing its meaning. Now you can also translate the word with this latest version.
Calcoolate lets us use a virtual scientific calculator online. You can directly input mathematical commands from the keyboard. The tool looks clean as there are no digits, just a handful of buttons for mathematical functions like sin, cos, tan, log etc. Its best for doing simple calculations.