Here is a list of all the software tools and applocations that I have used in creating the Whizz80 computer system. I currently use a Mac to do all my development on, so the software listed below are leaning towards the Mac side. I have however, tried to not use any 'os specific' software. There may be unfortunate exceptions and I'll indicate when this occurs.
Perhaps a little controversial as Eagle isn't an open source tool but a commercial tool. While I could use an alternative, such as KiCad, I'm more comfortable with using Eagle to design my schematics and layout my PCBs. I also find the performance of Eagle better on my Mac than Kicad. I am currently using the free version of Eagle and I will be making the files available in Eagle format, as well as PDFs for those who don't want to use Eagle.