DevBots
The Lock Issue bot automatically locks the conversation when an issue is closed.
The Lock Pull Request bot automatically locks the conversation when a pull request is closed.
The Needs Review bot monitors newly created pull requests and automatically adds a label of your choice to them.
The Needs Triage bot monitors newly created issues and automatically adds a label of your choice to them.
The Vacation bot can reply to new _pull requests_ and _issues_ with a special vacation message to let contributors know that responses may be slow due to holidays.