Alternatives to LTspice for Linux with Open Source License
|VLSI, circuit design tool with connectivity at all levels. Can also be used for schematic entry and PCB design.
|A printed circuit board design program for Microsoft Windows. FreePCB allows for up to 16 copper layers, both metric and US customaryunits, and export of designs in Gerber format. Boards can be partially or fully autorouted with the FreeRouting autorouter by using the FpcROUTE Specctra DSN design file translator.
|Protoboard view, schematic view, PCB view, Code (firmware) view. Includes customizable design rule checker. Includes common shaped boards like Arduino and Raspberry Pi shields. Allows spline curve traces. Only two layers (top and bottom). Outputs gerbers. Actively updated.
|schematic, simulation, PCB editor, gerber view
|Mixed-signal circuit simulator
|Full package for schematic and board design, etc. Design rule checking. User-defined symbols and footprints. Gerber/ drill file creation. Graphic interface. Active user community.
|KTechLab is a schematic capture and simulator. It is specifically geared toward mixed signal simulation of analog components and small digital processors.
|Full package for schematic and board design, etc. Design rule checking. User-defined symbols and footprints. Gerber/drill file creation. Graphic interface. Active user community.
|A popular very-large-scale integration layout tool
|SPICE + XSPICE + Cider
|Schematic capture + spice simulation
|A PCB design program for Windows featuring auto-routing, error checking, and DXF import/export.
|Quite Universal Circuit Simulator (QUCS)
|Schematic capture + Verilog + VHDL + simulation
|Verilator is the fastest free Verilog HDL simulator. It compiles synthesizable Verilog into cycle accurate C++ or SystemC code following 2-state synthesis (zero delay) semantics. Benchmarks reported on its website suggest it is several times faster than commercial event driven simulators such as ModelSim, NC-Verilog and VCS, while not quite as fast as commercial cycle accurate modeling tools such as Carbon ModelStudio and ARC VTOC.
|Used to produce netlists and publish high-quality drawings.
|A commercial grade parallel-processing analog simulator - engineered to replace SPICE simulators, and provide better performance (on compute farms).
Fritzing is an open source initiative to develop amateur or hobby CAD software for the design of electronics hardware, to support designers and artists ready to move from experimenting with a prototype to building a more permanent circuit.
I believe the first versions of SPICE could not have been developed on Unix. According to Wikipedia, SPICE1 was first presented by Berkeley researchers in 1973, but in the article on BSD Unix, it says "The first Unix system at Berkeley was a PDP-11 installed in 1974". So the earliest versions of SPICE actually predate the availability of Unix at Berkeley. From a historical article in IEEE. SPICE 1 came from CANCER. Nagel developed SPICE I on a CDC 6400 mainframe (probably NOT UNIX) and released it on April 12,1973. Spice 2 came out in 1975 (using vi and EMACS - so UNIX then) Ngspice is a mixed-level/mixed-signal circuit simulator. Its code is based on three open source software packages: Spice3f5, Cider1b1 and Xspice. Ngspice is part of gEDA... Free Open Source Mac OS X Windows Linuxngspice.sourceforge.net
The Quite Universal Circuit Simulator (QUCS) is an integrated circuit simulator allowing the simulation and graphical presentation of results of large-signal. Qucs-S is a spin-off of the Qucs cross-platform circuit simulator. "S" letter indicates SPICE. The purpose of the Qucs-S subproject is to use free SPICE.
Gerbv is an open source Gerber file (RS-274X only) viewer. Gerbv lets you load several files on top of each other, do measurements on the displayed image, etc. Besides viewing Gerbers, you may also view Excellon drill files as well as pick-place file