Radix Engine Toolkit
· The Radix Engine Toolkit is a library that exposes a set of functions to help clients written in kotlin to compile and decompile transactions, perform SBOR encoding and decoding, derive virtual account and virtual badge addresses, and other functionalities
Download JD-GUI to open JAR file and explore Java source code file (.class .java)
Click menu "File → Open File..." or just drag-and-drop the JAR file in the JD-GUI window radix-engine-toolkit-kotlin-1.0.3-fcd8536.jar file.
Once you open a JAR file, all the java classes in the JAR file will be displayed.