Nyquist is an elegant and powerful language for sound synthesis and music composition. Unlike score languages that tend to deal only with events, or signal processing languages that tend to deal only with signals and synthesis, it handles both in a single integrated system. It is also flexible and easy to use because it is based on an interactive Lisp interpreter. You can design instruments by combining functions (much as you would using the orchestra languages of Music V, cmusic, or Csound). You can call upon these instruments and generate a sound just by typing a simple expression. You can combine simple expressions into complex ones to create a whole composition. It runs under any Unix environment, MacOS, Windows 95, and Windows NT, and it produces sound files as output (or direct audio output under Windows).
WaveSurfer is a sound visualization/manipulation tool for novice and advanced users, with a simple and intuitive user interface. It can be adapted to different tasks, such as speech research and education, speech/sound analysis, and sound annotation/transcription. You can also make more advanced/specialized applications by extending it with custom plugins or embed WaveSurfer components in other applications. Its flexible interface handles many different file formats, and it runs on many flavors of Windows and Unix. It also supports encoding and Unicode with unlimited file size, and more.
The CMU Midi Toolkit (CMT) is a collection of software for writing interactive MIDI software in C. It includes a number of handy utilities along with an application "shell" that provides timing, scheduling, and MIDI interfaces that are portable across DOS, Mac, SGI, and Amiga platforms.
photos is a Web-based photo database for storing metadata about digital photos so you can find them again later. It supports adding photos one at a time, or as a group by directory. It is intended to be run locally but can be run on a remote Web server if you've got the space and the bandwidth.
OpenXAdES enables people to work with legally-binding digital signatures (primarily giving and verifying them). Legislation often defines a set of requirements that legal digital signature technologies and infrastructures must be compliant with, and OpenXAdES aims at meeting many, if not all, such requirements from different legislations.
P::Classes is a portable, high performance C++ application framework which provides many classes needed for real-world application development, emphasing on ease of use, size and stability. Its current highlights are a typesafe and threadsafe signal/slot mechanism, an I/O system including a plugin-based architecture for network-protocol transparent I/O, a plugin-based application message logging framework, classes and driver-plugins to access SQL databases, a message digest library, and classes for configuration management.
Interact is an online learning and collaboration platform that was developed by the Christchurch College of Education. It is a free alternative to the likes of WebCT and Blackboard, and was designed with the intention of making it easy for students and lecturers to interact online, and focuses on constructivist and Vygotskian views of teaching and learning.
h2incn tries to directly convert C/C++ headers to Nasm-style include files, and can be used in a makefile. It is useful if you want to use the same structures or external variable declarations in C and assembler code, and you don't want to use two separate files and update both each time you change something. It is written in a mix of C and C++ code. It currently works for simple files.