Are there any sites where you can play Grand Theft Auto games online?
There are thousands of sites where you can play online, for free. For example, you may want to try sites such as ArmorGames, 2flashgames, and others. If you use (for example) an Android device, you can go to the store and search for free games. You can also search the Internet for terms such as "free games", to get additional sites. Note that several larger online games (for example, Runescape) have their own websites.