Signal Generator is a laboratory noise/sound generator which can be used to generate accurate sounds in fixed frequency, 2-channels (two frequencies going at once), a sweep-pattern, or in a specified sequence. It is useful when you need to generate a fixed sound for whatever purpose (in the laboratory, for sound effects, etc)
ibistools is a small set of command-line tools that aid a PCB designer working with IBIS models. It currently consists of a full IBIS v4.1 parser and an IBIS to SPICE translator. IBIS (I/O Buffer Information Specification) is a standard, human-readable, machine-readable format for publishing IC specifications.
The CBOLD framework is a set of C++ classes and related source code for capturing board-level electronic designs. It allows the designer to capture and process an electronic board-level design using a text editor (or IDE) and a C++ compiler. It provides a concise, intuitive notation for schematicless capture of board-level designs. Instead of entering a schematic into an EDA tool, the designer creates a C++ program that describes the design and the desired outputs. When the program is compiled and run, it verifies the legality of the design and writes output files (CAD layout netlist, bill of materials, FPGA constraint files, etc.) to disk. Code primarily consists of definitions of modules, which are analogous to pages of a schematic design.
ElectricFormula is a program that can help with electronic based projects or problems. It can calculate electric power, resistance, current, or voltage. If given two of these variables as input, it can determine the other two. For example, if you want to calculate the resistance, you will have to supply the value for the electric power and current or you can supply the value of the power and voltage.
gEDA is a suite of electronic design automation (EDA) tools. Currently, the project offers a mature suite of free software applications for electronics design, including schematic capture, attribute management, bill of materials (BOM) generation, netlisting into over 20 netlist formats, analog and digital simulation, and printed circuit board (PCB) layout.