Yeks Guide to the Fractal Audio Drive Models
Forum member Yek (Alexander van Engelen) describes all Drive models in his Guide to the Fractal Audio Drive Models (PDF).
Current edition: May 2018.
The guide was preceded by a series of threads on Fractal Audio's user forum. Forum member Simviz assisted with migrating the contents of the threads to a PDF guide. Yek updates the PDF guide periodically.
Brief information about the Drive models, derived from the forum threads and PDF guide, is available here.
If you find the guide useful, consider donating to a good cause as explained in the guide.