Warden is described as 'FOSS app management utility' and is an app in the OS & Utilities category. There are four alternatives to Warden for a variety of platforms, including Android, F-Droid, Online / Web-based, Firefox and Google Chrome. The best alternative is TrackerControl, which is both free and Open Source. Other great apps like Warden are Exodus Privacy (Free, Open Source), ClassyShark3xodus (Free, Open Source) and Exodify (Free, Open Source).
Exodus Privacy lets you know what trackers are embedded in apps installed on your smartphone. It lets you also know the permissions required by any apps on your smartphone. It helps you take your privacy back!