There are two choices, both of which can be browsed in the Internet Archive:
In March 2016, ShaunS (Community Manager) gave a date for the removal of the Sandbox from their site- the 8th of April. Sandbox content will remain available for a period of time until the GameMaker: Player is fully live. GameMaker: Player will replace the Sandbox and as such uploading to the Sandbox will be disabled when the Player is released. In a FAQ for the Player from 2015, the question 'Is the sandbox being removed?' was answered: This was the first indication of YoYo's new direction for hosting their user's gamers, confirming that they were not interested in Sandbox anymore after a recent lack of updates.
The Player would be akin to Steam, allowing users to easily download and play games. In October 2014, James Foreman of YoYo Games (then Community Coordinator) announced the GameMaker: Player.
