XnViewMP is a free software to view, organise, convert graphics and photos files or to create slide show, contact sheet, HTML pages.
Compared to the original XnView, notable features in XnView MP have been re-tweaked, enhanced and visually re-styled. XnView MP is intended to have a unified look and feel across all platforms it runs on. All core features and functionalities of the standard XnView 1.9x are all still present in XnView MP, whilst some features are scheduled to be re-introduced.
Alternatives

• Irfan View
• FastStone Image Viewer 
• Picasa
• JPEG View
• Zoner Photo Studio
• Imagine
• Fast Picture Viewer

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Windows