rt is an n-dimensional raytracer. It supports any positive number of spatial dimensions, color and grayscale, cylinders with an arbitrary number of round dimensions (spheres and cubes are special cases of cylinders), quadratic surfaces, convex hulls, regular polytopes, unions, intersections, cuts, extrusions, reflection, refraction, functional texture maps, portals into other traces, ambient light, multiple light sources, directional light sources, gamma correction, fish-eye effect, and output as PNG or PPM. It has been tested under DOS, Solaris, Digital Unix, FreeBSD, NetBSD, Linux, Ultrix, System V, and BeOS.
Runmaint is a shell script for invoking regular jobs. It delivers the output (if any) via mail with a meaningful subject line to the people of your choice. It moves all the complexity from the crontab into an easily managed collection of scripts. Runmaint expects to be run out of cron.
Sash is a stand-alone shell for system recovery in Linux. Its purpose is to make system recovery possible in many cases where there are missing shared libraries or executables. It does this by firstly being linked statically, and secondly by including versions of many of the standard utilities within itself. Some of these built-in commands are chattr, chmod, chown, cp, dd, ed, find, grep, gzip, ln, ls, mkdir, mknod, more, mount, mv, rm, and tar.
sash-plus-patches is a collection of patches for the well known standalone shell, sash. The key features are the chroot, pivot_root, and losetup functions. These functions provide interfaces to the respective Linux system calls. They are especially useful when sash is used in a initial ramdisk ("initrd") environment. In addition, simple shell variable expansion support has been added.
sdts++ is a free C++ toolkit that can be used to write applications that read and write Spatial Data Transfer Standard (SDTS) files. Currently there is a great deal of free geospatial data stored in SDTS format, including USGS Digital Line Graph (DLG) and USGS Digital Elevation Model (DEM) data.
serverizor allows you to take a normal command- based program, and run it as a tcp server in the background. This means that you can start up such programs once, and then connect to them with a command-line client, and run commands, disconnect, connect again from some other machine, etc. So, you can use it to boot up a large program such as emacs or lisp (in interpretor mode, not in editor/windowing mode) in the background, and then whenever you want to run emacs/lispy scripts, you could just run a serverizor client with a few commands. Therefore, the client and the server are the same program.