Article taken from GamingOnLinux.com.

Don't Starve Together is now in Open Beta. Don't Starve is a wilderness survival game and this standalone expansion adds new content as well as multiplayer.If you already own Don't Starve and didn't sign up for the beta you will receive Don't Starve Together when it officially launches. If you can't wait you can buy into the beta with a heavy discount by buying the Frontier Pack and receive a copy for a friend. If you don't own Don't Starve you can purchase the full priced Frontier Pack for access to the game and a copy for a friend.To access the beta:-You must already own Don't Starve Together-In your Steam client right click on Don’t Starve Together Beta and select “Properties”-Select the “Betas” tab-Enter the code “osxlinuxbeta” in the text box and press the “Check Code” button. You should see a confirmation message that the osxlinuxbeta beta is now available.-In the drop-down under menu select to opt into osxlinuxbeta. You should see a message that you have successfully opted into the osxlinuxbeta beta. Press “Close”.You can check out the game on Steam here.