With the end of the World Series yesterday any player with at least six years of service time and not under contract or option to a ML team automatically becomes a "free" agent. MLB Trade Rumors has posted a list of those players currently available. This list will change (for a while, grow) as options are declined and as some player are non tendered. I would suggest you review it to determine which players are still available.
Here is the link.
http://www.mlbtraderumors.com/2011/04/2 ... gents.html

