I was recently wanting a list to quickly identify whether any integration packs were available for a particular application. Having not found any complete-looking lists, I started putting one together. But lo and behold, during my research I came across another great-looking list that seems very comprehensive which I hadn't been aware of. So, I abandoned my list and will refer to this one instead.
For future reference, here's the link:
System Center Orchestrator Integration Pack Reference List by ScorchCenter
Kudos to the ScorchCenter team for putting this together!