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Litmus
Email on Acid
MailChimp
250ok
Brevo
Sparkpost
Constant Contact
SourceForge
GitHub
GitLab
BitBucket
openDesktop.org
Gitea
Launchpad.net
OSOR
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SourceForgeLitmus - litmus tests and tracks your email campaigns, so you can always put your best design forward.
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.
Email on Acid - We make the send button safer. For every campaign, every message, and every inbox, Email on Acid has the time-saving tools you need to put your best email forward.
GitLab - Create, review and deploy code together with GitLab open source git repo management software | GitLab
MailChimp - MailChimp is the best way to design, send, and share email newsletters.
BitBucket - Bitbucket is a free code hosting site for Mercurial and Git. Manage your development with a hosted wiki, issue tracker and source code.