There's LTI and BasicLTI as well. I'm sure there are more, but I'm not really involved in the space much any more. I do know this. I get phone calls from a friend in the industry asking for help, and every time I take a peak under the covers, I see that things continue to suck very, very hard. One of the biggest problems is bad implementations of an already lackluster standard.

I would posit as an axiom that getting good developers to work with shitty tools is a major hurdle to getting said developers to stick around. IMO, Clever will have a positive impact on the development of educational content, because they will abstract away a lot of the "suck" associated with interfacing with the common SIS/SMS applications in the market.

SCORM's a little different - it's a standard for "content objects" (think videos, quizzes, chunks of text) that should enable to content to be plugged into a variety of learning management systems. The "next generation" of SCORM is the Tin Can API/xAPI (http://tincanapi.com/). These standards were sponsored by the Department of Defense & haven't seen adoption in K-12 (that I'm aware of).