This looks like something well worth looking into if you need some collaboration features in your app quickly: ShowKit!
ShowKit is a mobile SDK that enables iOS developers to add in-app Audio/Video Conferencing, Screen Sharing, and Remote Control between mobile devices to their native apps. We recently introduced our SDK to market and are looking for beta testers. If interested, you can access our beta by typing in promo code “SKIT87” here.
As a reward for entering our beta you’ll get your first 50,000 Minutes of call time free (normal starting rate is 25,000 minutes of free calls once our beta is over).
Don’t have time to check it out ourselves right now, but that’s a pretty unique set of drop in features and it’s very nicely documented and the pricing seems reasonable, so if you’ve got a use for on device conferencing/VNC type stuff, we wholeheartedly encourage you to sign up with that “SKIT87” code and let us know what you think!