Browse your photos with pwall.
This app is modern style photo viewer and organizer.
It shows the folders of your photos main directory
in the left pane and a photowall in the right.
The photowall is a scrolling panel of square thumbnails
giving a preview of each photo. Loading and unloading of this
scrolling panel is made dynamicaly, viewing page by viewing page
like smartphones do.
It also allows you to have basics management of photos
(change dates, copy a group of photos to another directory, delete, share, get GPS data...).
Clicking on a photo opens it in fullscreen mode. You can continue your navigation in this mode with left and right keys.
I use it as an alternative to Shotwell.