libspopc is an easy-to-use POP3 client library written in C. It implements the client side of RFC 1939, providing an easy and quick way to support POP3 and POP3s (SSL) access in a program. It can download email headers and delete messages remotely without actualy downloading the message.
Do178Builder is a documentation tool used throughout the software/hardware development effort, helping to produce the DO-178B/254 documentation much less painfully. A major obstacle to creating airborne products, for smaller developers, is the necessity to qualify the software per RTCA/DO-178B, or hardware per RTCA/DO-254. Without this qualification, airborne products cannot be deployed.
GTK+-DirectFB is a backend for GDK, the drawing kit used by GTK+. Since DirectFB provides drawing functions, a windowing stack, and manages input devices, this is a lightweight GDK port. GTK+-DirectFB is based on GTK+-2.0 and implements the drawing functionality encapsulated in GDK. It allows you to run standard GTK+-2.0 applications on the Linux framebuffer. Due to the use of DirectFB, graphic operations are hardware accelerated if a suitable DirectFB gfx driver is available. Since DirectFB is a very thin library, the memory footprint of GTK+-DirectFB is relatively small.
Device::ParallelPort is a Perl API that allows low level access to the parallel port of most computers. It does this by using a number of drivers, which can be customized and added to, including Linux (direct and parport), Win32, Script, Dummy, and more. It also contains a number of direct access devices including an example printer and a relay controller card.