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.
GIPHY for iMessage - The easiest way to share all the GIFs in all your txts
4Gifs.com - Funny Animated GIF archive.
MojiLaLa Unlimited for iMessage - 32,000 original stickers by 450+ artists all over the world.
Gif Finder - Gif Finder is another platform that allows you explore, upload, and share Gif files.
Doll Up Stickers - Dress up your messages.