MySocialApp - Seamless Social Networking features for your app
Planetary - Decentralized social media by and for the people.
Thunkable - Powerful but easy to use, drag-and-drop mobile app builder.
DeSo - DeSo is a new layer-1 blockchain built from the ground up to scale decentralized social applications to one billion users.
Manyverse - A social network off the grid
Android Creator - Make your app for Android phones and tablets