RightGIF - Less noise, better GIFs. A better /giphy for Slack.
Slack Meme Bot - Spice up your team conversations with memes
MemesChain - Own & monetize your memes, with the power of Blockchain & AI
Yarn for Slack - Drop TV and movie clips into your Slack chats
Meta Meme - Meta Meme: Easy Meme Creation is a free to use Web and Mobile-based application that allows you to create memes using text, images, or even videos.
VixT on Slack - The best video mashup app now on Slack.