AI tools are exploding. But which ones actually work? This book maps 6,494 verified AI engines across 69 categories — from research and writing to image, video, code, and beyond. Built on the GAIT 69 taxonomy (DOI: 10.5281/zenodo.20248631), every entry is verified and categorized by a human researcher, not scraped. Available on Amazon Kindle ($9.99) and Paperback ($19.99). Also on Gumroad with full database access bundle.