GitHub Notifier vs PullApprove: What are the differences?
What is GitHub Notifier? Chrome notifications for GitHub (open source). Under the hood, this application simply polls GitHub web endpoints (/pulls|/issues|/releases) of projects you specify, it doesn't require OAuth tokens or credentials entering into the extension.
What is PullApprove? Approve Pull Requests with a comment. Just start a comment with "Approved" (or a custom regular expression) to sign-off without ever leaving GitHub. PullApprove can be configured by a .pullapprove.yml YAML file in the root of your repo. With it, decide exactly what "approval" means to your team.
GitHub Notifier and PullApprove can be categorized as "Tools for GitHub" tools.
GitHub Notifier is an open source tool with 42 GitHub stars and 10 GitHub forks. Here's a link to GitHub Notifier's open source repository on GitHub.