PixelFed - PixelFed is a federated image sharing platform, powered by the ActivityPub protocol.
CollageIt - CollageIt is an easy-to-use and automatic collage maker, which makes photo collage automatically.
Gab - Gab is an ad-free social network dedicated to free speech.
PhotoSpills - Easy to use PC collage software with unlimited design possibilities.
Friendica - Decentralisation - Privacy - Interoperability
Collagerator - Create amazing photo collages in few mouse clicks. Ready for download for Mac OS X and Windows.