How Many Donor Databases Are There?

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I thought it might be useful to compile a list of all of the commercial donor databases I’m aware of. This list came from my head, my bookmarks, and lists compiled by NTEN and Idealware for their donor management software surveys (and I’m not certain all of these are actually donor databases). Feel free to let me know what I missed, which systems no longer exist, and which aren’t really donor databases.