BRL-CAD is a powerful cross-platform constructive solid geometry solid modeling system that includes an interactive geometry editor, ray-tracing for rendering & geometric analyses, network distributed framebuffer support, image & signal-processing tools.
Integrated Development Environment for some microcontrollers based on 8051(e.g. AT89S8253). Supported languages are Assembly and C. It has its own simulator, assembler, editor and many other tools. See the project web site for more details and the newest updates.
dna2abc turns DNA sequences into musical sequences. The key feature is the rule editor; a rule is a regular expression paired with a Tcl script. dna2abc scans a DNA sequence, testing each regular expression: if it matches, the Tcl script is run.
avrLab is an IDE (integrated development environment) for AVR microcontroller from ATMEL. It includes an editor with syntax highlighting. avrLab includes support for macro assembler (tavrasm and avra) as well as support for accessing the AVR via uisp.