STDU Viewer is a free viewer for multiple file formats that aims to replace
the multiple document viewers with one simple application. STDU Viewer
supports TIFF, PDF, DjVu, XPS, JBIG2, WWF document formats which are the most
popular formats for scientific and technical documentation. Additionally STDU
Viewer supports FB2, TXT, Comic Book Archive (CBR or CBZ), TCR, PalmDoc(PDB),
DCX and image (BMP, PCX, JPEG, GIF, PNG, WMF, EMF, PSD) files. (in Education)