Firing Range
Firing Range is a test bed for web application security scanners
...Each scenario is crafted to reflect how bugs appear in production—behind frameworks, in odd encodings, or across redirects—so scanners must demonstrate accurate crawling and context understanding. Because the behaviors are stable and documented, teams can run comparative tests over time and quantify regression or improvement in their pipelines. It’s equally useful for human training, giving analysts a safe playground to practice exploitation and triage skills.