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.
SAC performs login accounting, just like the ac program but with total, per day, per user and per tty. It also performs average usage, hourly profiling, login listing, login clipping and raw wtmp reporting as well as tons of other options. SAC supports Tacacs 3.x/4.x and most Radius accounting files.
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.
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.
SeeR compiles to bytecode and executes scripts written in the C/C++ languages (with some restrictions/addons). It supports many instances of the script, multitasking and more. It is multiplatform, and easily integrates with anything (can access your program variables, functions and classes). It contains a SeeRC script compiler/interpreter, and can be used easly in shell scripts (like Perl).