GIFSOM - Create GIFs up to 4 seconds from sources like YouTube, Facebook Videos, TikTok, Twitter, and more in high quality. GIFSOM stores the GIFs absolutely free.
Rif - Product Hunt for reaction GIFs
4Gifs.com - Funny Animated GIF archive.
MapBoard - Map + whiteboard ~ real time multi user doodle map
Gifyu - Upload GIF Images and Share Pictures Online
Crumbles - Crumbles are like reaction GIFs with a way bigger vocabulary