Source: http://www.vlsiacademy.org/open-source-cad-tools.html

OPEN SOURCE CAD TOOLS

Tool	Description	Type	Function
Xcircuit	A general-purpose drawing program and also a specific-purpose CAD program for circuit schematic drawing and schematic capture.	Mixed signal	Schematic
Ktechlab	Is a schematic capture and simulator.it is a an IDE for microcontrollers and electronics. It supports circuit simulation, program development for microcontrollers and simulating the programmed microcontroller together with its application circuit.	Mixed signal	Schematic, simulator and microcontroller
gnucap	A general purpose circuit simulator with its engine designed to do true mixed-mode simulation.The primary component is a general purpose circuit simulator. It performs nonlinear dc and transient analyses, fourier analysis, and ac analysis. Spice compatible models for the MOSFET (level 1-7), BJT, and diode are included in this release.	Mixed signal	Circuit simulator
ngspice	A mixed level/signal circuit simulator	Mixed signal	Circuit simulator
qucs (Quite Universal Circuit Simulator)	Qucs is a circuit simulator with graphical user interface. The software aims to support all kinds of circuit simulation types, e.g. DC, AC, S-parameter and harmonic balance analysis. Pure digital simulations are also supported using VHDL and/or Verilog.	Mixed signal	Simulator + Verilog + VHDL
IRSIM	Is a switch-level simulator originally originating from Stanford	Mixed signal	Circuit simulator
Icarus Verilog	Is a Verilog simulation and synthesis tool. It operates as a compiler, compiling source code written in Verilog (IEEE-1364) into some target format. For batch simulation, the compiler can generate an intermediate form called vvp assembly. This intermediate form is executed by the "vvp'' command. For synthesis, the compiler generates netlists in the desired format.	Digital	Simulator & Synthesis
Verilator	Verilator is the fastest free Verilog HDL simulator. It compiles synthesizable Verilog, plus some PSL, SystemVerilog and Synthesis assertions into C++ or SystemC code. It is designed for large projects where fast simulation performance is of primary concern, and is especially well suited to create executable models of CPUs for embedded software design teams.	Digital	Verilog HDL simulator & synthesis
ghdl	Is a tool to generate metal layers and vias to physically connect together a netlist in a VLSI fabrication technology. It is a maze router, otherwise known as an "over-the-cell" router or "sea-of-gates" router.	Digital	VHDL simulator (doesn't do synthesis)
ChipVault	Is a chip development program for organizing VHDL and Verilog designs. ChipVault displays designs hierarchically and provides for rapid design navigation and editor launching. ChipVault provides hooks for performing bottom-up tasks such as launching RTL compilers, synthesis, block generation and instantiation, and includes simple to use Revision Control and Issue Tracking systems to help facilitate large group design projects with multiple designers and hundreds of design files.	Digital	VHDL & Verilog RTL compiler & synthesis
GTKwave	Is a waveform viewer that can view VCD files produced by most Verilog simulation tools, as well as LXT files produced by certain Verilog simulation tools.	Mixed signal	Wave viewer
Gwave	Is a waveform viewer for the output of analog electronic circuit simulators such as spice. It displays the data as 2-D plots, andallows for interactive scrolling, zooming, and measuring of thewaveforms	Analog	Wave viewer
LabPlot	Is a free software data analysis and visualization application built on the KDE Platform	Analog	Wave viewer
gEDA Suite	A full suite of Electronic Design Automation tools.	Mixed signal	Full suite (electrical circuit design, schematic capture, analog and digital simulation, prototyping, and production)
Alliance	Is a complete set of free CAD tools and portable libraries for VLSI design. It includes a VHDL compiler and simulator, logic synthesis tools, and automatic place and route tools. A complete set of portable CMOS libraries is provided, including a RAM generator, a ROM generator and a data-path compiler.	Mixed signal	Design flow from VHDL up to layout, (VHDL Compilation and Simulation, Model checking and formal proof, RTL and Logic synthesis, Data-Path compilation, Macro-cells generation, Place and route, Layout edition, Netlist extraction and verification, Design rules checking)
Electric	Electric is a sophisticated electrical CAD system that can handle many forms of circuit design, including custom IC layout (ASICs), schematic drawing, hardware description language specifications, and electro-mechanical hybrid layout	Mixed signal	From HDL to layout and some extra
Magic	Magic is a venerable VLSI layout tool. Magic VLSI remains popular with universities and small companies. Magic is widely cited as being the easiest tool to use for circuit layout, even for people who ultimately rely on commercial tools for their product design flow.	Mixed signal	Circuit Layout
Toped	Is a cross-platform IC layout editor supporting GDS, OASIS and CIF formats. It is an open source project licensed under the GNU General Public License. The project is under active development. focuses on rendering speed and quality of the screen output.		IC layout editor
Netgen	A tool for comparing netlists, in analog or mixed-signal circuits that cannot be simulated in reasonable time.	Mixed signal	LVS
Dragon	Dragon is a fast, effective standard-cell placement tool for both variable-die and fixed-die ASIC design. It was designed and implemented by NuCAD group in Dept. of ECE, Northwestern University, and ERLAB in Computer Science Dept., UCLA. Dragon does wirelength and routability optimization by combining powerful hypergraph partitioning package (hMetis) with simulated annealing technique. It is a university tool that produces high-quality placement comparable with commercial software such as ITools (formerly TimberWolf) and Cadence QPlace.	Digital	Placement
Fairly Good Router (FGR)	FGR is free open-source software for global routing, based on Lagrange Multipliers --- an approach similar to what industry routers use, but with greater mathematical rigor and robust performance. Unlike most other academic tools, FGR is self-contained and does not rely on ILP or external Steiner-tree constructors.	Digital	Router
Qrouter	Is a tool to generate metal layers and vias to physically connect together a netlist in a VLSI fabrication technology. It is a maze router, otherwise known as an "over-the-cell" router or "sea-of-gates" router.	Digital	Detail router
OS-VVM	Open Source - VHDL Verification Methodology (OS-VVM) delivers advanced verification test methodologies, including Constrained and Coverage-driven Randomization, as well as Functional Coverage, providing advanced features to VHDL design engineers while enabling them to continue to develop using VHDL.	Digital	Verification
Teal	Helps you perform verification by providing a set of capabilities that access HDL signals and enable actions based on changes in the values of these signals.	Digital	Verification
Jove	Is a set of Java APIs and tools to enable Verilog hardware design verification of ASICs and FPGAs using the Java programming language.	Digital	Verification
PCB	Is free software for designing printed circuit board layouts. It has many features and is capable of professional-quality output.	PCB	The printed circuit board layout editor
FreePCB	Is a free, open-source PCB editor for Microsoft Windows, released under the GNU General Public License. It was designed to be easy to learn and easy to use, yet capable of professional-quality work.	PCB	PCB editor
Fritzing	Integrated tool for breadboard, schematic, and PCB design. Targeted at non-engineers (designers, artists, researchers, hobbyists) and users of micro-controller platforms such as Arduino.	PCB	Breadboard, schematic, and PCB design
KiCad	KiCad provides for all design stages through the same interface: Schematic capture, PCB layout, Gerber generation/visualization, and library editing are all standard features. It also has a "3D view" feature for PCBs. It is available for all three major operating systems	PCB	PCB schematics and layout
OMNeT++	Is a discrete event simulation environment. Its primary application area is the simulation of communication networks, but because of its generic and flexible architecture, is successfully used in other areas like the simulation of complex IT systems, queueing networks or hardware architectures as well.	Electronic system level	Detail router
SystemC	Clunky class library for digital design.	Electronic system level	Clunky class library for digital design
myHDL	Is a Python package for using Python as a hardware description language.	Electronic system level	Hardware description language