GOG is the largest DRM-free PC game store, owned by CD Projekt. Every GOG game can be downloaded as a standalone installer with no client required — they're yours to keep, back up, and run offline forever.
GOG runs seasonal sales similar to Steam, alongside frequent curated sales (RPG, Adventure, Indie Spotlight). GOG Galaxy is an optional client offering achievements, cloud saves, and a cross-store launcher.
Yes — GOG installers contain no client, no online check, no copy protection. Once downloaded, the game runs without any account or internet connection.