Shizuku is described as 'Enables direct access to Android system APIs for apps using adb or root privileges, operating through a Java process without needing a root shell for faster communication' and is a android root manager in the system & hardware category. There are seven alternatives to Shizuku for Android, Android Tablet, F-Droid and Windows. The best Shizuku alternative is Magisk, which is both free and Open Source. Other great apps like Shizuku are KingoRoot, APatch, KernelSU Next and KernelSU.
Shizuku alternatives are mainly Android Root Managers You can also filter by region, for example
EU-based alternatives if you prefer software developed in the European Union. These are just examples - use the filter bar below to find more specific alternatives to Shizuku.