Flixier - Flixier Pro is an online video editor that speeds up your workflow with 1 minute rendering on any device, streamlined communication and collaboration features and plenty of cloud storage.
RightGIF - Less noise, better GIFs. A better /giphy for Slack.
Kamua - Automate video resizing, cut-downs & captions for social
Slack Meme Bot - Spice up your team conversations with memes
Flo - Voice based video editing app powered by A.I & Deep Learning
Yarn for Slack - Drop TV and movie clips into your Slack chats