I'd love to see this. I'm a huge fan of the information availability the internet has brought and a firm believer that education is transforming into something we do of our own volition and in our own way, aided by freely available information online, and what you're working on sounds like potentially an excellent tool congruent with these ideas. Do you have something you could show yet?
I'm a IT teacher in special education and got frustrated with the available materials and with my students having to log in everywhere to practice.
Pure HTML, CSS, Javascript. No cookies. You could even download the files from Github or download the site and it will still work.
I'm a pretty bad coder, but this is a lot of fun.