STDU Explorer is a piece of software that offers you the opportunity to work with image files (support psd, bmp, png, gif, pcx, jpeg, wmf formats) and e-books in DjVu, PDF, FB2, MOBI, AZW, JBIG2, XPS, DCX, WWF, PDB, EPub, CBR and CBZ formats. It is a freeware image exploring application that's professional and advanced.
Here is a screenshot to illustrate the features and user interface of this application:
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