OK maybe im getting carried away with the categorisations now!. Can you developers out there all behave and stop getting all innovative and stop morphing and evolving!. OK seriously though there are some solutions that are a clear Hybrid of two or more categories listed here so putting them in this section.
Splice works a lot like other OMC solutions in ‘OMC Services’ in that you create a profile, invite users to your sessions and post your projects (with mixdown) for others to hear and join in. Splice also takes on aspect of File Sharing. Download and install the splice app and when you want to share project simply drag the session folder to the Splice folder or work directly out of the Splice folder. The session is automatically uploaded and can be shared with other people. Splice works with Ableton Live with Pro Tools and Fruity Loops soon to be added. its Currently in Private Beta so go to the site to be added to waiting list. Check it out Here
Blend.io are new kids on the block and adding to the ever growing list of Online Collaboration sites out there. again this site uses the same basic principle as the other OMC Services sites but it integrates with dropbox which you use to “pull” a session down to your local machine. because of the way it works users will only collaborate people using the same applications i.e. ableton live or pro tools.