The GOG autumn sale has begun and straight out of the traps you can get sandbox action role-playing game Mount & Blade for free (it will remain free for 48 hours).
GOG is also offering The Witcher 2 for free - a game made by the development arm of its parent company CD Projekt - but you have to collect stamps each day by visiting the site in order to claim it. Seven stamps, seven days, claimed by clicking 'collect stamp'.
Or you could just buy The Witcher 2 for £1.89 - a deal that will last for the next five hours.
The GOG autumn sale also has many other deals, timed, bundled or otherwise.
All games bought on GOG are DRM-free. They're yours to do what you want with.