Petite Chez Scheme is a freely distributable interpreted version of Chez Scheme, a high-performance implementation of ANSI Scheme with numerous extensions. Petite Chez Scheme may be used as a run-time environment for compiled Chez Scheme applications or as a stand-alone Scheme system. With the exception that the compiler is not present, Petite Chez Scheme is completely compatible with Chez Scheme.
C Scripting Language (CSL) is an embeddable scripting language with C syntax. A comprehensive set of libraries is included in the base package, and writing your own libraries is possible with an easy API for C programs, as well as a class interface for C++ programs. If you are looking for a compact and powerful scripting engine for your application, CSL might be the choice.
Lush is a Lisp dialect with extensions for object-oriented and array-oriented programming. It is intended as a programming environment for prototyping numerically intensive applications. Unlike alternatives like Python or SciLab, Lush is designed for easy integration of existing C/C++/Fortran codes.