Humble Bundle https://www.humblebundle.com/
Bundle Stars http://www.bundlestars.com/
Indie Gala https://www.indiegala.com/
Groupees http://groupees.com/
Indie Royale http://www.indieroyale.com/
Blink Bundle http://www.blinkbundle.com/
The Free Bundle http://www.thefreebundle.com/
Games Rage https://gamesrage.org/