I'm on the fence about it just because I'm so happy with PhotoDemon.
Steps: Download portable version from the website or softpedia, extract and launch ImageGlass.exe
Requirements: WinXP+, dotNET Framework 4.0+
Websites:
- http://www.imageglass.org/
http://www.imageglass.org/download
http://www.imageglass.org/documentation ... ed-formats
http://www.softpedia.com/get/PORTABLE-S ... able.shtml
License: GPL v3 (http://www.imageglass.org/source)
Sreenshot: