HenHub: Travel WODs! But this WOD generator is great for all types. It also includes a mobility generator if you're looking to stretch and work specific parts of your body.
Ringtraining.com: Gymnastics ring training training for elite fitness training. Provides articles, workouts, and training tips specifically for use with gymnastics rings.
StrongSwiftDurable: Training resources geared toward mountain athletes, military athletes, law enforcement athletes, and fire and rescue athletes
Body Weight Culture: A program cultivating the art of using nothing more than your body weight to better your fitness
Gymnasticsbody: Offers different programs for purchase in order to improve your gymnastics skills and strength
Beastskills: Tutorials and products for improving your game, especially in relation to body weight skills