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This is the website for one of the most useful graphic viewing/editing/conversion tools that I know of.
Using plugins it has view/play support for most major graphic file formats as well as many audio & video formats.
Conversion is only supported for conversion to certain graphic formats.
A useful graphic editor is also included.
GIMP runs on Windows, GNU Linux, Max OSX, SSun Open Solaris, and FreeBSD operating systems.
Graphic Formats Supported: TIFF, JPEG, GIF, PMG, PSD, TGA, BMP, XWD, XPM, PIX, CEL, MNG, PPM, PCX.
I use wikidPad for organizing information in several areas with a dedicated wiki for each area.
wikidPad runs on Windows, Linux, & Max OSX.
This application is open source. It runs on Windows, Mac OSX, most flavors of Linux, most flavors of BSD, Solaris, Android, ios, & OS/2.
It is easy to use and provides a very consistent interface for all the file formats it supports.
It runs on Windows, Linux, & Max OSX
Import and export WAV, AIFF, AU, FLAC and Ogg Vorbis files.
Optionally import/export mp3, AC3, M4A/M4R (AAC), and WMA with additional libraries.
It has a very full featured editor.
This program functions like Windows Update for many non-Microsoft applications.
It is fairly easy to use and the free version for individuals is highly recommended.
I use it to keep my own PCs software up to date.