I am in the process of finalizing an enrollment plugin that will take enrollment data from SISAPIs to help populate Moodle. SISAPIs are projects like Clever and LearnSprout. I would mention InBloom, but due to their utilization of a UI with their API (apui as its been dubbed) I have not included them in this particular plugin.
In any case, I have staged the github project already and it is available here:
I still need to work on documentation and getting it all ready for deployment, but I have tested the plugin with Clever and have it working on a Moodle 2.5dev branch on my hosted VPS.
Just wanted to bring it to everyone's attention just in case I am missing something in the github or anyone has any feedback!