RightGIF - Less noise, better GIFs. A better /giphy for Slack.
The Wub Machine - Turn any music into Dubstep, Drum & Bass, and more.
GoGifApp - Free Slack GIFs App, multiple images to pick from at once
The Eternal Jukebox - For when your favorite song just isn't long enough
Camo - Use your iPhone or iPad as a pro webcam
YOU.DJ - Mix SoundCloud music and Youtube videos live in your browser.