CommitLint will fail commit messages, in a GitHub pull request, that don't adhere to your team's convention. This brings consistency to your project and makes searching commits easier.
PR Scheduler is a GitHub App that allows developers to schedule pull requests to be merged at a specific date and time. It works great for scheduling blog posts on static content frameworks like Jekyll, Hugo and Octopress. To schedule a PR, just add a comment.
CommitCheck is a tool that checks GitHub commit messages, PR titles or PR descriptions against a regex. Common use cases include: Checking for a JIRA number, ensuring there aren't any WIP commits, making sure that PR descriptions have a link to the docs.