Hmmm, no I've never heard of this although I've used a similar offline doc reader called Zeal.
I just checked it out and it looks cool but I don't think it's for me. I use a Firefox extension called Saka Key that allows me to fully navigate web pages and tabbing with the keyboard but it doesn't work so well when a web page wants to be an app instead of a page. The site forces focus in a text search box and pressing escape doesn't leave the text box, it just replaces displaying the welcome message. It's a usability issue for me :(
I just checked it out and it looks cool but I don't think it's for me. I use a Firefox extension called Saka Key that allows me to fully navigate web pages and tabbing with the keyboard but it doesn't work so well when a web page wants to be an app instead of a page. The site forces focus in a text search box and pressing escape doesn't leave the text box, it just replaces displaying the welcome message. It's a usability issue for me :(