- EasyEDA
- PartSim
- EveryCircuit
- Circuit Sims(Falstad Circuit)
- DC/AC Virtual Lab
- CircuitsCloud
- CIRCUIT LAB
- TinaCloud
- CircutMaker
- Simulator.io
- Gecko simulations
- MultiSim
However, I have come to find Eagle is most prevalent. Here is a link to SparkFun on how to use it.