Confluence is a functional programming language for reactive system design, including FPGAs, ASICs, and hard-real-time software. Confluence system descriptions have a large information to linecount ratio. It is typically two to five times more compact than Verilog. Confluence can compile a single body of source code into to Verilog, VHDL, C, and NuSMV.
QCADesigner is a Quantum-Dot Cellular Automata (QCA) circuit simulator. With powerful CAD capabilities, it allows the designer to quickly layout and simulate QCA circuits constructed with thousands of QCA cells. QCA is one of several emerging nanotechnologies with potential applications in future computers.
nMicrocoder is an ncurses EDA tool to write microcode. Basically, it is a stripped down spreadsheet program that lets you fill a table with "0", "1", and "-", and gives you compile-ready verilog code in return. It was written as an alternative to full spreadsheet programs. It is known to run on Linux, IRIX, and Solaris, unless ncurses 5.3 is installed.
Alliance CAD System is a set of EDA tools and portable cell libraries for VLSI design. It covers a wide range of the standard design flow (from VHDL up to layout). It includes a VHDL simulator, RTL synthesis tools, place and route tools, netlist extractor, DRC, and a layout editor.
YaPIDE aims to be a fully featured Microchip PIC simulator for Linux (and probably other Unixes). It is a GUI that provides a viewer for RAM, ROM, stack, breakpoints, and watchpoints, and has a source editor with inline debugging (ASM). The chip currently supported is the 16F628 (partial).
JCCad is a project to develop a 2D/3D CAD program that can be used to create technical drawings. One of the main goals of this project is to include a plugin system to allow usuaries to make new commands. In this way it will be easy to use the program for any particular task. JCCad provides an easy interface with a command line.