AdoptOpenJDK is described as 'The code for Java is open source and available at OpenJDK™. AdoptOpenJDK provides prebuilt OpenJDK binaries from a fully open source set of build scripts and infrastructure' and is an app in the Development category. There are five alternatives to AdoptOpenJDK for a variety of platforms, including Linux, Mac, Windows, BSD and Blackberry 10. The best alternative is Java. It's not free, so if you're looking for a free alternative, you could try OpenJDK or Liberica JDK. Other great apps like AdoptOpenJDK are Zulu (Free Personal, Open Source) and RedHat OpenJDK (Free, Open Source).
OpenJDK is the free version of the Java development platform. The OpenJDK project consists of a number of components. Principally these are HotSpot (the virtual machine), the Java Class Library and the javac Java compiler.
The only certified multi-platform build of OpenJDK : Free, 100% open source Java for Windows, Linux (including Docker), Mac OS X, the Cloud and embedded applications. Featuring tier-one Java support via Zulu Enterprise.