XV is an interactive image viewer for the X Window System. XV displays
images in GIF, JPEG, TIFF, PNG, PBM, PGM, PPM, X Window System bitmap,
Utah Raster Toolkit RLE, PDS/VICAR, Sun Rasterfile, BMP, PCX, IRIS RGB,
XPM, Targa, XWD, possibly PostScript, and PM formats on workstations
and terminals running the X Window System Version 11.

XV can also manipulate pictures. It can zoom in and out, rotate, and
flip them. It also provides a wide variety of operations to modify
colors.

It is one of the most famous programs for Linux.

The documentation can be found in /usr/share/doc/packages/xv/.

Please remember that this program has shareware status for commercial
use.