About GitHub Apps
GitHub Apps are tools that extend GitHub's functionality. GitHub Apps can do things on GitHub like open issues, comment on pull requests, and manage projects. They can also do things outside of GitHub based on events that happen on GitHub. For example, a GitHub App can post on Slack when an issue is opened on GitHub.
Finding GitHub Apps
You cannot install third-party applications on your enterprise. If you want to use the functionality of a third-party app, you can contact the app developer about creating an app from a manifest or from URL parameters. For more information, see Registering a GitHub App from a manifest and Registering a GitHub App using URL parameters.
You can also build your own GitHub App. For more information, see