The itch.io app, itch, gives you a simple way to download and install your library of games with a few clicks.
LGOGDownloader is a downloader to GOG.
28 Aug 2013)
Steam is a online gaming platform that provides the ability to distribute games and other content directly to gamers around the world.
21 Jan 2011)
Desura is a gaming client that allows users to one click download and install games.