KiCad
PCB & electronicsOpen-source electronics design automation suite
- Stars
- 3k
- Licence
- GPL-3.0
- Status
- Open source
Alternative to Altium Designer, Eagle
Free alternatives to OrCAD
Cadence's schematic, PCB and PSpice simulation tools. Here are 3 free options, most popular first.
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Qucs-S
PCB & electronicsCircuit simulator GUI using ngspice, Xyce and other engines
- Stars
- 1.4k
- Licence
- GPL-2.0
- Status
- Open source
Alternative to OrCAD
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ngspice
PCB & electronicsOpen-source mixed-signal SPICE circuit simulator
- Licence
- BSD-3-Clause
- Status
- Open source
Alternative to OrCAD
Check file compatibility before switching. Free tools import STEP, DXF and other neutral formats well, but native SolidWorks, Altium or Revit files, drawing standards and PDM workflows may not carry over cleanly.