The Great Grappling Jiu-Jitsu app provides a searchable structured index for the 200+ Brazilian Jiu-Jitsu (BJJ) technique videos from the YouTube channel of Jeremy "The Gerbil" Arel, https://www.youtube.com/user/GGBJJ. Techniques are organized by position (full guard, half guard, mount, etc.) and category (submission, transition, sweep, etc.) The app tracks which videos have been watched and presents the extensive notes that accompany each video in an easy-to-read format.
Please note that although the app. is tagged as ad-supported the only ads it includes are those that YouTube displays when you watch the technique videos.