BRL-CAD is a powerful constructive solid geometry solid modeling system that includes an interactive geometry editor, ray-tracing support for rendering and geometric analysis, path-tracing for realistic image synthesis, network distributed framebuffer support, and image and signal-processing tools.
OpenRADIUS is a RADIUS server that allows you to use external data sources for anything - shared secrets, accounts and passwords, profiles, session database, NAS lists, called/calling nr. ACLs, accounting storage, and much more. It has a powerful external module interface that uses pre-spawned subprocesses and pipes for communication, allowing you to implement modules in any language that supports Unix pipe I/O. Its behaviour is fully configurable, using a simple built-in language that gives you full control over the request and reply list. It includes versatile LDAP and SQL modules, a full featured RADIUS client, and a fully functional example configuration for metered pre-paid accounts.
Ch is an embeddable C/C++ interpreter for cross-platform scripting, shell programming, 2D/3D plotting, numerical computing, and embedded scripting. It is the simplest solution to numerical computing and visualization in the domain of C/C++. It supports the ISO 1990 C Standard (C90), major features in C99 (complex numbers, variable length arrays or VLAs, type generic functions, long long data type, etc), classes in C++, and extensions to the C language like nested functions, string types, etc. It can be embedded in other applications and hardware and used as a scripting language. C/C++ code is interpreted directly with no compilation to intermediate code. It supports Linux, Windows, MacOS X, Solaris, HP-UX, and FreeBSD.
Spackle is designed to be a flexible client/server architecture for the gathering and displaying of statistics, primarily suited to monitoring servers. It's written in PHP and bash shell script, uses RRDtool for stats logging and graphing, and PostgreSQL or MySQL for the server-side database.
MP3DB2 is a collection of bash scripts for keeping track of large MP3 collections. It will retrieve song information from the filenames and ID3 tags of a directory or CD of MP3s and store them in a local database. It then allows you to search any of the fields, generate a master listing of all your complete albums, see the size of your entire collection, and more.
SATSHELL is a GUI interface builder for shell scripts. The GUI screens are described using a simple easy-to-learn screen layout language (SAT/DL). The interface between SATSHELL and shell scripts is very simple as it uses the standard input/output mechanism. There are currently the following features: labeled entry boxes, buttons, check buttons, radio buttons, multi-column list boxes, drop-down select list, toolbars (with balloon help), menus, display text, borders and lines, and support for function keys.