itch.io - An online game marketplace and community.
GitHub - Originally founded as a project to simplify sharing code, GitHub has grown into an application used by over a million people to store over two million code repositories, making GitHub the largest code host in the world.
Humble Bundle - Buy a bundle of games, you decide the price, and support charity in the process.
GitLab - Create, review and deploy code together with GitLab open source git repo management software | GitLab
The Indie Gala - Buy a bundle of games, you decide the price, and support charity in the process.
BitBucket - Bitbucket is a free code hosting site for Mercurial and Git. Manage your development with a hosted wiki, issue tracker and source code.