Perapera is a pop-up dictionary and study tool for Japanese and Chinese. It works as a free add-on for Firefox and Chrome.
I started studying Chinese in around 2005 and one of my roommates at the time (we were teaching English in Japan) challenged me to make this plugin after I made a comment that this sort of software would be the best way to study Chinese.
He bet me I couldn’t make it and I’m not one to turn down a wager, so I took 2 weeks to create the first version just for us. Once it was done, I thought many students of Chinese and Japanese would also find this useful, so I released it on Firefox.
Some years later, we joined forces again and started Perapera Language Tools. We have many ideas for more optimal ways to study different languages and are planning the release of more apps in the future. We will also introduce study resources and methods that we personally found useful.
Now also offering a world-beating Japanese translation service! More details here.