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
Camera Roll - Simple Gallery App for Android, with lovely Material Design.
data.world - The social network for data people
A Photo Manager - Manage local photos on Android: gallery, geotag with photomap, tags, find, sort, view, copy...