Google just launched something called Chrome Apps, which is basically a way for web developers to make apps very similar to “normal” Windows programs. Among other things, it has offline support.
This might be interesting for the WaniKani developers out there … 
http://www.theverge.com/2013/9/5/4696618/google-chrome-apps-chrome-os-windows-os-x-blink
Interesting~ Will be interesting to see any apps that come out of this considering the amount of chrome apps we already have.