digiKam - Professional Photo Management with the Power of Open Source
Kap - Kap is an open-source screen recorder built with web technology.
XnView MP - XnView is a free software that allows you to view, resize and edit your images. It supports more than 500 different formats!
Flux - Application Architecture for Building User Interfaces
FastStone Image Viewer - FastStone Image Viewer is a fast, stable, user-friendly image browser, converter and editor.
KPhotoAlbum - KPhotoAlbum is a tool which you can use to easily sort your images.