I dont know of any for free, typically they are sold for hundred of dollars. In my case flight safety sent me one before class that was an online version and that cost I believe 300 bucks (I did not pay for it).

IMO I thought it was useless and if I paid for it I would have been dissapointed, you learn more in the CPT and the sim. I found our fms to be fairly intuitive and not that difficult to learn.