What are some alternatives?
When comparing Tall Tweets for Google Slides and Automatic GIF Creator, you can also consider the following products
Plotaverse - Photo animation made easy, animate like the pros
Gifs - Search through a library of hundreds of GIFs that you can send in your messages or that you can share to social media pages.
Instagfy - Make a GIF with your most popular photos on Instagram
GIPHY Says - Turn your words into animated GIFs!
Gif Your Face - Create an animated GIF using your webcam in under 10 seconds
Plotagraph - Animate your static photographs in an intuitive way