Converseen is an open source project written in C++ with the powerful Qt4 libraries. Thanks to the Magick++ image libraries it supports more than 100 image formats. You can convert an unlimited number of images and / or create thumbnails to any of the most popular formats: DPX, EXR, GIF, JPEG, JPEG-2000, PDF, PhotoCD, PNG, Postscript, SVG, and TIFF.
With Converseen you can save your time because it allows you to process more than one image with one mouse click!
Converseen is very simple: it features a very simple user interface without strange options.
It needs QT4, (newer than the version in puppy's repository), so I've uploaded a .pet here(5979kbytes): qt-4.5.3.pet