As far as I can see, it was bundled with KiCad:
(lldb) image list ... [291] 0E2AFABD-30BD-36D5-969E-8D7A3249A272 0x000000010be78000 /Applications/Kicad/kicad.app/Contents/Frameworks/libngspice.0.dylib ...
As far as I can see, it was bundled with KiCad:
(lldb) image list 30BD-36D5- 969E-8D7A3249A2 72 0x000000010be78000 /Applications/ Kicad/kicad. app/Contents/ Frameworks/ libngspice. 0.dylib
...
[291] 0E2AFABD-
...