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.
Slack Themes - Make your Slack pretty with custom themes
GitLab - Create, review and deploy code together with GitLab open source git repo management software | GitLab
Branded Slack Themes - 1,000+ themes to customize your Slack
BitBucket - Bitbucket is a free code hosting site for Mercurial and Git. Manage your development with a hosted wiki, issue tracker and source code.
Rainglow Color Themes - 320+ color themes for a variety of editors and software.