Duotone - Convert any photo to a duotone in seconds
Giffing Tool - Giffing Tool is simply put: The fastest creator of high quality captioned GIFs available.
Dreamscope - Make and share 'deep dream' images using dozens of supplied styles or your own.
Gifox - Delightful GIF Recording and Sharing App for macOS
Photo + Music = Video - Photo + Music = Video (also known as Video Slideshow Editor) developed by Manas Hive.
Data GIF Maker by Google - Google's new tool turns boring data into GIFs!