BeanShell is a small, free, embeddable, Java source interpreter with object scripting language features, written in Java. BeanShell executes standard Java statements and expressions, in addition to obvious scripting commands and syntax.
WLShell is an interactive command-line shell for BEA WebLogic Server. WLShell provides simplified access to management beans (MBeans) in WebLogic Server through a scripting language. If we think of WebLogic Server as an operating system, WLShell can be considered as a telnet program to access WebLogic.
Bex Script is a (yet another) scripting language for the Java platform. It is heavily based on another great scripting language BeanShell. It features Loose typing – variables have no type, functions are first class objects, minimal syntax, small – about 100k jar file.