GitPigeon - GitHub notifications delivered to your Mac
Patreon - Patreon enables fans to give ongoing support to their favorite creators.
Gitify - GitHub Notifications on your desktop.
Liberapay - Liberapay is a recurrent donations platform.
Neat.run - Neat puts SaaS notifications in your menu bar. Streamline your code review and ship with ease. Preview, triage, and jump to issues in one click or keystroke.
Ko-fi - Ko-fi offers a friendly way for content creators to get paid for their work.