The best alternatives to SPUN are Slate, GIFjam for Messenger, and MemeMill. If these 3 options don't work for you, we've listed a few more alternatives below.
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Hurree— The smarter, simpler way to analyze your data
Amuse your friends by your meme making skills and be a star on social media! Create funny memes using photos from your gallery or stock photos. Use the app as a gif maker and create funny memes using gif images...
Hitr is an iOS app we built to make a whole new way to make short videos by customising and tuning the original video - replacing some scenes with your own stuff.
A Whole new addition to Meme network - Create in 3 steps - Share with Memers' Community - Love, Comment, Share, Remix, Award favorite memes - Join Contests, Win Prizes - Add Background, Sunglass to your profile...