In the original Unix BSTJ of 1978 Sandy Fraser described a system he called "Circuit Design Aids". Schematic capture was done on a 4014 and conversion went all the way to wire wrap. CDA was rehabbed and rewritten by many people over the years. It became known as the Unix Circuit Design System (UCDS) and it was available from Bell Labs under a separate license as I recall. UCDS was used to design many projects including the 5620, Belle and others. When Plan9 arrived, UCDS was converted to Plan9 (not too hard...) and renamed back to CDA. The code was released in the first Plan9 CDROM. So. It occurred to me that I could back port it to Linux. I did so with help from H. Trickey and the Plan9 compatibility library. I put all of this code on https://github.com/kahrs/cda. The interested and curious can find it there. I make no promises about full functionality, however, it is available for those who want to tinker.