Meme Creator Bot - Create cool memes over a bot
RightGIF - Less noise, better GIFs. A better /giphy for Slack.
Meme Trends - Like Google Trends for Memes
Yarn for Slack - Drop TV and movie clips into your Slack chats
Mematic - Mematic – Make Your Own Meme is another free to use meme generator application developed and published by Trilliarden.
Firesong - Giphy for Music in Slack w/ Emoji Search