Microsoft has announced the two free games for their Games For Gold program. To sum up, if you are an Xbox Live Gold member, these two games are free for a limited time.
Starting May 1, 2014, Dust: An Elysian Tail will be free through May 15th. This XBLA game normally sells for $15.
Then starting on May 16th, Saints Row: The Third will be free until the last day of the month. This Games On Demand game normally sells for $20.
New titles are available on the 1st and 16th day of each month.