rgbproc-repository is intended for use with Xilinx EDK tools. It consists of many units written in VHDL that can be used to build a design for image/video processing. The backbone is the data bus (called simply RGB) that is used to pass data (typically) from VGA input to VGA/DVI output.
rnio is a minimalistic nio framework for Java. With rnio, it is easy to use non-blocking network sockets in Java. Internally, rnio runs a set of selectors and handles the thread pool for the network-related tasks. This means that non-blocking network connections can be fully event-based.
These are the demo programs that accompany O'Reilly's "PNG: The Definitive Guide." rpng is a simple file viewer with the ability to set a background color when displaying transparent PNGs. rpng2 is a progressive PNG viewer, designed to work like a web browser (though it contains no network code); it can generate a background image when displaying transparent PNGs. wpng is a simple converter from NetPBM to PNG format; in most respects it is much more limited than pnmtopng, but it supports interactive entry of PNG text annotations and will generate noninterlaced PNGs on the fly (rather than buffering the entire image first like pnmtopng). The viewers include simple front ends for both X and Win32; the converter is a command-line app that compiles on Unix, Windows, and probably other platforms.