pwall is a free and open source photo viewer and photo organizer for Linux. It converts your photos in a square thumbnail and shows as a photo wall where you can manage your photos. you can view the images by folder wise and it comes with some basic features as open, copy or move photos to another directory, delete, share and change dates in your photos. It also offer a option to search and get GPS data of the image and show on google map. currently it supports only png and jpeg file types. It is still in early stage.