SYINF shows in brief a system's CPU brand and model, RAM size, disk space, operating system, regional parameters, and current date and time. It can run in interactive (menu) or batch mode. There are two versions, in the C and C++ languages. They have been tested on 20 (15) compilers, 26 (25) operating systems, and 18 architectures. (Figures in parentheses are for the C++ version.) Both versions are conveyed in source code form only, each as a single ~35 KB source text file.
spdylay is an experimental implementation of Google's SPDY protocol in C. It provides a SPDY framing layer implementation. It does not perform any I/O operations. When the library needs them, it calls the callback functions provided by the application. It also does not include any event polling mechanism, so the application can freely choose the way of handling events. This library code does not depend on any particular SSL library (except for example programs that depend on OpenSSL 1.0.1 or later).
BNNS is a research tool for interactive training of artificial neural networks based on the Response Function Plots visualization method. It enables users to simulate, visualize, and interact in the learning process of a Multi-Layer Perceptron (MLP) on tasks that have a 2D character. Tasks include the famous two-spirals task or classification of satellite image data.
xmlsd is a library that wraps expat in order to simplify XML use in C programs as well as adding rigid rules to an XML structure. The idea is to have XML structures that can be passed over the network with implicit parameter verification. This in turn enables back and forth chattering between applications.
clens is a convenience library that aids in porting code from OpenBSD to different operating systems. Operating systems traditionally have different enough APIs that porting code is painful and can litter pretty code with ugly #ifdefs. In order to keep code readable and drastically reduce the number of #ifdefs needed, clens brings other APIs or missing functions into specific OS "focus".
SHTns is a high-performance Spherical Harmonic Transform library. It was designed for numerical simulation (fluid flows, mhd, etc.) in spherical geometries, but can be used for any kind of problem involving scalar or vector spherical harmonics. It is very fast, thanks to careful vectorization and runtime tuning. It supports multi-threaded transforms via OpenMP. It features scalar and vector transforms, synthesis and analysis, and flexible truncation and normalization. A Python interface is included.
PDFvcon is a GUI front-end for Ghostscript that converts the version of a PDF document. If you have software that can accept only up to version 1.4 of a PDF document and the file you have is 1.6, then this is your answer. It was created out of a need for the author to be able use some of his old Windows software.