Img.vision - Image hosting & video hosting for eCommerce sellers
Dia - Dia is a GTK+ based diagram creation program for GNU/Linux, MacOS X, Unix, and Windows, and is released under the GPL license.
BeeIMG - BeeIMG is a simple, fast, easy image sharing solution created to fill up your image sharing needs.
draw.io - Online diagramming application
ImageVenue - ImageVenue is a great online hosting service that allows uploading pictures for showing creative works with a simple-to-use technique.
yEd - yEd is a free desktop application to quickly create, import, edit, and automatically arrange diagrams. It runs on Windows, Mac OS X, and Unix/Linux.