PictureTags is a gallery app that uses tags rather than albums or folders to organise your photos. It is optimised for quickly tagging photos, tagging other tags, and browsing photos and tags. It has a number of other features:- Import and export your pictures and tags in a smart archive format- Basic smart tags: Recently Added, Recently Modified, Starred, Untagged- Fullscreen image view- Different view widgets for landscape and portrait orientation- Custom shortcuts; make a shortcut straight to a tag- Fullscreen tag browsing in landscape mode: see the subtags, supertags and neighbour tags of a tag all at the same time when in landscape modeSee the website for more features, an FAQ and the list of features coming up soon.