Outcast - Second Contact tops the list of September’s free offerings. The game is a remake of the critically acclaimed open world game Outcast that was released in 1999. The title is an open world action role-playing game that has players explore the alien world of Aldephia. Though it is a remake of game that is more than 20 years old, Outcast - Second Contact remains popular among fans. The title boasts an 85% positive user score on Steam.

Two of this month’s freebies were developed by Curve Digital. The first is Autonauts, a world building simulator where players colonize uninhabited planets and build entire towns from the ground up. The game starts out with only a few rudimentary tools, but after a few hours of crafting players are able to create factories, farms and even a spaceport. Players also construct and command an army of bots to inhabit these settlements. The second game from Curve Digital is Pumped BMX Pro. The premise is simple yet fun: players get a BMX bike and show off their moves while riding off of various jumps.

The 3D action-adventure game Effie is also free this month. The game’s graphics and gameplay are inspired by classic Dreamcast and Nintendo 64 platformers, but updates the genre by allowing players to explore an open world. The title is blends classic platformer gameplay with a knack for exploration.

Tiny Troopers: Joint Ops is an arcade-style first-person shooter. Players take control of their tiny trooper to take on waves on enemies, either solo or with a friend.