[PC, Steam] Free to Play Weekend - Hearts of Iron IV / Desperados III / Retimed @ Steam

A number of free to play games for the weekend are now live on Steam. The full games are also on sale. Games include;

Hearts of Iron IV - ends on 20th September
Desperados III - ends on 20th September
Retimed - ends on 19th September

The first two I've heard of, haven't played them yet. The last game seems more like an indie, looks fun though.

Hearts of Iron IV
Victory is at your fingertips! Your ability to lead your nation is your supreme weapon, the strategy game Hearts of Iron IV lets you take command of any nation in World War II; the most engaging conflict in world history.

Desperados III
Desperados III is a story-driven, hardcore tactical stealth game, set in a ruthless Wild West scenario. Play smart if you want to succeed. A good plan can make the difference between survival and finding yourself at the business end of a pistol.

Retimed
Dash and dodge bullet clusters in nerve-wracking slow motion moments and challenge your friends online or offline to awesome and fast paced battles with up to 4 players!