If you’re designing and building stuff on breadboards or stripboards, check out this free, neat program.
It’s the easiest one to use that I’ve found so far. Just select what breadboard you’re using, start placing out the components and connect them up with jumpers and cables. The selection of components is quite limited, but all the essentials are there, like DIP-format IC’s, resistors, diodes, capacitors and such.
When you’re done, you can export the design to PDF or a PNG-image.
It’s written in Java, so it requires that to run. I’ve only tested it on Windows, but it should run on other platforms as well.diy layout breadboard prototype design