Moonshiner is a graphical frontend for Ghostscript's PostScript-to-PDF converter. While Ghostscript (and its wrapper ps2pdf) is a very powerful instrument, it is quite challenging to use its parameters on the command line, especially if you often change the settings as to what kind of color conversion, image resampling, etc. you want Ghostscript to perform. While the author has never used Adobe's Distiller, and thus cannot really compare the two, Moonshiner (as the name suggests) is supposed to be a work-alike for the Linux world (at least GUI-wise, as the actual work is of course done by Ghostscript).
JGrit is a program that converts images from common formats (e.g. GIF, JPEG, BMP, and PNG) to source code that can be used to render the image on either the Game Boy Advance (GBA) or the Nintendo DS (NDS) system. There are already programs that do this, but none that play nicely with both Windows and Linux. It uses the grit command line tool as a backend.
SILVERCODERS OCR Server is a server-based optical character recognition (OCR) and PDF conversion solution for enterprises. It is able to perform conversion of printed documents to editable and searchable formats like plain text, RTF, PDF, and HTML, providing highly accurate recognition in 189 languages. It is available as a Linux application or a stand-alone machine, with a fully documented API, very good performance, and flexible licensing rules. It has been designed specifically for the purpose of cooperation with document management systems such as SILVERCODERS DocStorage.
TAMOGEN is designed either to create a mosaic of one image out of another or to create a mosaic of one image out of itself. Instead of selecting images from a pool on a best-fit basis, the generator utilizes one user-identified image to create a mosaic of another user-identified image by altering the tone of the component image. TAMOGEN will create color or black-and-white mosaics of arbitrary size.