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.
Calcurse is a text-based calendar and scheduling application. It helps keep track of events, appointments, and everyday tasks. A configurable notification system reminds the user of upcoming deadlines, and the curses based interface can be customized to suit user needs. All of the commands are documented within an online help system.
Herrie is a command line music player. It has a split-screen file manager and playlist interface and supports a number of file formats (MP3, Ogg Vorbis, wave, FLAC, etc). It also has some nice features, including a chroot() function for untrusted setups (remote logins, parties, etc). AudioScrobbler is also implemented using Curl.
Kannel is a WAP gateway. It attempts to provide this essential part of the WAP infrastructure freely to everyone so the market potential for WAP services, both from wireless operators and specialized service providers, will be realized as efficiently as possible. It also works as an SMS gateway for GSM networks. Almost all GSM phones can use it to send and receive SMS messages, so this is a way to serve many more clients than just those using a WAP phone. Kannel was among the first WAP gateways to be certified as WAP 1.1 compliant.
Oink is a collaboration of backends for the Elsa C and C++ frontend. It aims to be industrial-strength for immediate utility in finding bugs, extensible for ease in adding backends, and composable for ease in combining existing ones. It computes expression-level and type-level data flow, and statement-level intra-procedural control flow (by delegating to Elsa). It's easy to get started by using the two demo backends that print graphs of these flows. It also comes with a client of the data flow analysis that does type qualifier inference: Cqual++, a C/C++ frontend for Cqual. Whole-program analyses may be attempted using the linker imitator.
TiVo File Decoder software converts a .TiVo file (produced by the TiVoToGo functionality on recent TiVo software releases) to a normal MPEG file. This has the same functionality as using TiVo's supplied DirectShow DLL on Windows with a tool such as DirectShowDump, but is portable to different architectures and operating systems, and runs on the command line using files or pipes. The conversion still requires the valid MAK of the TiVo which recorded the file, so it cannot be used to circumvent their protection, simply to provide the same level of access as is already available on Windows.
coNCePTuaL is a domain-specific programming language for rapidly generating programs that measure the performance and/or test the correctness of networks and network protocol layers. A few lines of coNCePTuaL code can produce programs that would take significantly more effort to write in a conventional programming language.