As of last night Ubisoft put their tactical shooter Rainbow Six: Siege for players to try for free during this weekend. You may have heard that there is another DLC coming November 17 called Operation Red Crow, and this free weekend is meant as a build up towards that.
If you haven't tried Rainbow Six: Siege yet, this is a good opportunity for those of you who have a PC or a PlaSstation 4. You can find it on PSN and Steam, and play all weekend long.