Transition Mattes Toolkit is a massive After Effects template containing 204 pre-created transitions with 13 categories and tools to create and customize hundreds more. You can easily reverse, flip, apply textures, change shapes, add blur and so much more. It's really well organized and easy to use. Great for creating stunning slideshows, presentations, events, promos, intro and openers. Detailed documentation and previews are included. Available in 4K.