It's not free, but my company actually bought a license for me - so free to me. I'm currently using Testout.com, it uses a combo of online lectures, simulated labs and is working really well for me so far. For their entire Library of certification info, the cost is about $1200 on special and access is good for 3 years. You can also just do a single cert program (about$500-$700) if that's all you need. They have CompTIA, Cisco, Microsoft, Linux certs... Not the cheapest option, but a lot cheaper than GlobalKnowledge or some other vendor where you would have a live instructor. I like it because I can go at my own pace and study anywhere.