Python is what I use. Its actually fun just to play with as the module library (scripts) that comes with it is outstanding, from crypto,CGI,database,math, Socket Server,...ect. Its also VERY easy to learn and maintain (i.e NOT pearl).
Python is copyrighted but freely usable and distributable, even for commercial use.
Its the scripting lang thats used in Caligari's TruSpace 4 (www.caligari.com) and in Alice (www.alice.org)
They can describe it better than I can so here it is :
"Python is an interpreted, interactive, object-oriented programming language. It is often compared to Tcl, Perl, Scheme or Java.
Python combines remarkable power with very clear syntax. It has modules, classes, exceptions, very high level dynamic data types, and dynamic typing. There are interfaces to many system calls and libraries, as well as to various windowing systems (X11, Motif, Tk, Mac, MFC). New built-in modules are easily written in C or C++. Python is also usable as an extension language for applications that need a programmable interface. "