Sociall (Beta) - A secure and private decentralised social network for all.
F-Stop Media Gallery - Image and video organizer.
Manyverse - A social network off the grid
A Photo Manager - Manage local photos on Android: gallery, geotag with photomap, tags, find, sort, view, copy...
data.world - The social network for data people
LeafPic - LeafPic is a fluid, material-designed alternative gallery.