@acw I've done a lot of stuff with the MSP-430. Yes, TI's Code Composer Studio is hella balls. But there is a forked version of the Arduino IDE that has been made to work with the TI LaunchPad line: http://energia.nu/
It's "okay", about as "good" as the Arduino IDE, which is to say "not at all," but it is what it is. Nobody ever accused electrical engineers of being good software developers.
Yeah, you could do it as a webapp, now that WebBluetooth is a thing.
Generalistic and moderated instance.