The most widely used OS/2 JPEG viewers are:

PMJPEG 1.83: OS/2 2.x port of WinJPEG, a popular viewer/converter for
Windows (see description in previous section).  Shareware, $20.  Available
from http://www.pixvision.com/html/downloads.html.

PMView 1.00: JPEG/GIF/BMP/Targa/etc viewer.  GIF viewing very fast, JPEG
viewing roughly the same speed as the above two programs.  Has image
manipulation & slideshow functions.  Shareware, $35.  Available from
hobbes.nmsu.edu:/pub/os2/apps/graphics/viewer/pmvw100.zip.

Galleria 2.31:  JPEG/BMP/PCX/Targa/TIFF viewer/editor/converter.
Shareware, $65.  Available from
hobbes.nmsu.edu:/pub/os2/apps/graphics/viewer/galleria231.zip.

All of these viewers require Palette Manager for best display quality.
Opinion seems to be about equally split as to which is the best, so try
them all to see which one you like.

JPEGPROC enables all OS/2 multimedia applications to read and write JPEG
files.  Available as part of the "Practice Viewer Upgrade" which also
includes a multimedia browser alleged to be better than IB.EXE.
Shareware.  Available from hobbes.nmsu.edu:/pub/os2/dev/mm/pvu110.zip.

OS/2 executables of the free IJG conversion programs are available from
hobbes.nmsu.edu:/pub/os2/apps/graphics/imagepro/jpeg6a_os2a.zip.

Note: the hobbes OS/2 collection is mirrored at ftp-os2.cdrom.com.