I ported Christian Corti's great IBM 5110 emulator to JavaScript, so you can work with an emulated IBM 5110 directly in your (HTML5-capable) web browser.
There are still some bugs in it, disk and tape support are still missing, and I could not test it with a non-German keyboard layout. I nonetheless wanted to share the WIP version to give you a first impression. You can try it out and write some small BASIC or APL programs at http://members.aon.at/nkehrer Greetings Norbert