SoftwareIvePaidFor
Whether through purchasing it or donating to a tip jar:
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IrfanView
Official Homepage - one of the most popular viewers worldwide - http://www.irfanview.com/
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Anyview
do the best exprience for mobile reader - http://www.ismyway.com/en/index.html
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SDF Public Access UNIX System
Free Shell Account and Shell Access - http://sdf.lonestar.org/
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Contexts — Window Switcher