We worked on a similar tool with Digi-Key called Scheme-it. It does not offer RTC, but it's free. The goal with Scheme-it to be an electrical engineering "Vis

We worked on a similar tool with Digi-Key called Scheme-it. It does not offer RTC, but it's free. The goal with Scheme-it to be an electrical engineering "Visio" type application. http://www.digikey.com/us/en/mkt/scheme-it.html http://www.digikey.com/us/en/mkt/scheme-it.html