XnView
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XnView Classic
XnView is a feature-packed photo manager supporting over 500 file formats, offering extensive viewing options, powerful search tools, and bulk editing capabilities.
XnConvert
XnConvert is a highly recommended tool for batch image conversion, supporting over 500 formats and offering customizable options like frames, watermarks, and effects.
XnView MP
XnView is a free, fast image viewer supporting various formats, featuring a user-friendly interface and comprehensive tools, comparable to ACDSee.