The best replacement for altium is orcad.

The best alternatives to altium are rated as following:
★★★★★  orcad
★★★★  pads
★★★  cadence
★★  proteus
★★  mentor graphics
★★  pulsonix
★★  allegro
★  multisim
★  protel
★  diptrace
★  cadstar
★  kicad
  ultiboard
  dxdesigner
  zuken
  ltspice
  pcad

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