3Play Media: Captioning and Accessibility Guides · The Library · Artistic Accessibility Collective

A large free library of practical guides on captioning quality, legal requirements (CVAA, FCC, ADA), file formats, audio description, and platform-specific specs. Vendor-published but genuinely useful as a plain-language reference for the rules and mechanics of captioning. A good first stop when you need the how and the why in one place.