At almost 30 pages in Google Docs, this is an amazing list of ability, ultimate, and character interactions in Overwatch. It includes a ton of testing and video clips that offer proof of various in-game interactions for every character in the game, and the author has taken cares to update it with new game patches and heroes.
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Want to hear about new resources? Suggest changes or updates? Berate me for writing or adding garbage? Come hang out in my Discord. It consists of a channel where I only post updates for this resource thing. It may eventually contain further channels. I don't really know how to work this thing oh god help I need an adult. "This thing" being social interaction, not Discord.