The National Space Science Data Center's (NSSDC) Common Data Format (CDF) is a self-describing data abstraction for the storage and manipulation of multidimensional data in a platform- and discipline-independent fashion. It consists of a scientific data management package (known as the "CDF Library") that allows programmers and application developers to manage and manipulate scalar, vector, and multi-dimensional data arrays.
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.
CryptNET Passgen (passgen) is a password generator. It generates a list of password candidates for the user to choose from by mapping operating system sources of pseudo-randomness into printable character arrays using a mod operation. A number of available command line options gives it a great deal of flexibility. It is capable of generating passwords composed of printable characters, alphanumeric characters, alphabetic characters, or only numeric characters.
iterate simply takes a command line with an inserted dollar sign, $, and substitutes $ with entries from a list. Each such inserted command line is executed sequentially. The list can either be specified in the command line or in a file. iterate is particularly useful in sending commands to clusters of nodes. It was written with SSH/plink in mind.
BlockHosts is a script to record how many times a local system is attacked, based on configurable scanning of system logs for sshd or other services. When a particular IP address exceeds a configured number of failed login attempts, that IP address is blocked using hosts.allow files, or by using null-routing, or by using packet filtering. An email notification facility is also available.
HLA Adventure is an adventure game that was written in Randy Hyde's HLA language. It features Mippy, a cute dragon that lives happily in the forests and caves and often comes out during the later part of the day to eat leaves, smoulder decaying trees, and generally romp around like every good dragon should.