Yes you read it correctly, Sins of a Solar Empire is currently free on Humble Bundle while stocks last or until November 22nd at 10am Pacific time. All you have to do to qualify is sign up to the Humble Bundle newsletter.
You can check out an official trailer below:
Released in 2008 to positive reviews, Sins is best described as a space age RTS with elements of 4X game play. The makers (Ironclad Games) describe it as RT4X gaming. Your take control of an entire space faring empire and set about conquering the rest of the galaxy through either diplomatic, economic and of course military means!
You can grab your free copy from Humble Bundle
You can visit the Sins homepage for more information.