Growing article, with links to many related topics. [Wikipedia]

Interpreted, with 1 type (all is data) only, made with Java; can be used as strings of its own code or as Java objects, code (even 1-line program) can write or modify other code; main purpose: write artificial intelligences that modify (parts of) them...

Object-oriented extension to C language. Solves many of the problems associated with C++.

Full-featured, semi-dynamic object-oriented language. [Open source, GPL]

Project to create object-oriented language that is easy to learn for beginners.

Experimental, innovative, object-oriented, interpreted language, and programming environment LavaPE; edits programs via syntax-sensitive point-and-click style structure editors, not text editors; parameterized (virtual) types, refactoring, static checks.

Ruby-like expressiveness + static type checks, like Haskell. [Open Source, GPL]

OO language based on, integrated with, Java (compiler emits Java bytecode); features of functional programming, implements state-of-art results from academic research, for more expressivity, modularity, safety. [Open source, GPL]

Dynamically compiled, object-oriented language and environment, especially suited for web applications.

Interactive geomatic object-oriented language for spatial modeling, image processing, remote sensing, digital photogrammetry, geographic information system (GIS), geodesy, and surveying and mapping.