Wikipedia:SWViewer

Warning: You take full responsibility for any action you perform using SWViewer. You must read and understand Wikipedia policies and use this tool within these policies, otherwise you risk losing access to the tool or even being blocked from editing.

SWViewer (direct link) is a user-friendly webapp that is used to detect and revert vandalism, spam, and other types of unconstructive edits made at various Wikimedia projects. With a simple and intuitive UI, you can monitor changes in real-time. In doing so, it provides a lot of features, such as the ability to rollback edits, tag pages with speedy deletion, and edit source on the page. To use the application, the rollback permission is required.