Much like the Xbox Games With Gold program, PlayStation offers free games to its PlayStation Plus members every month. Starting March 5th, Call of Duty: Modern Warfare Remastered and The Witness will be available for subscribers to download. Both of these games are fantastic in their own right and deserve a look if you’re interested.
Of particular note with this iteration of the lineup is that PlayStation Plus will stop offering PlayStation 3 and PlayStation Vita games from here on. The current PlayStation Plus games for PlayStation 4 are available for download until March 4th, while the games for PlayStation 3 and Vita are available until March 8th. Any PlayStation 3 and Vita games downloaded prior to this date through the service will still remain available to you, as long as you maintain an active subscription.
Source: PlayStation Blog