I hope I'm posting this on the good forum... I installed "Fedora Linux Electronic Lab" yesterday (it's a Fedora Linux distribution with some electronics programs preinstalled) and inside there was KTechLab, an awesome graphical simulator with some components (sources, passive, transistors, LEDs, switches, logic gates, some ICs) and a logic probe, an oscilloscope, a voltmeter, and more... It's just awesome for a newbie like me. The downside is that you need Linux for this (Fedora is good, I haven't tried it in Debian or Ubuntu) but it's really easy to use and you get a free graphical oscilloscope. Links: The home page a screenshot Feel free to move this post if it's the wrong place. That's all!