TL:DR; PhotoView is an easy and compact photo viewer for Windows.
PhotoView is an easy and compact photo viewer for Windows. It allows you to view and organize your digital photos easily and comfortably.
Alteros 3D is a 3D/2D graphic file viewer with a customizable interface. Supports any 3D files (3DS, VRML, TrueSpace, LightWave and many other formats), as well as 2D graphical files (PSD, PNG, TIF, JPEG, BMP, GIF), Video, Audio files and DVD.
Preview PDF documents in Windows Explorer and Microsoft Outlook in Windows 10 without opening. The freeware program installs a PDF preview handler add-in and shows a thumbnail preview for icons and also the icon changes to the one from PDF Preview.
STDU Viewer is a document viewer for multiple file formats. The goal of this software is to replace the multiple document viewers with a single simple application. STDU Viewer supports following document formats: DjVu, TIFF, PDF.