OO prototype-based, reflective language, based on only message passing, a key trait of OO languages; it allows late-binding polymorphism, the key trait making possible incremental modifying of programs. Descriptions, papers, implementations: Smalltalk, C++, Java, Scheme; MiniMix.

High-level, pure object-oriented, prototype-based, scripting language; Smalltalk-like syntax; some features borrowed from Scheme, Self, JavaScript. [Open Source, LGPL]

Small prototype-based high-level language, influences: Smalltalk (all values are objects), Self (prototypes), Eiffel (Design by Contract); allows system, low-level programming, compiler has means for late binding suppression, optimizing type predictions and code specialization, gives target code high efficiency.

A runtime-extensible language built on top of SML/NJ designed for building collaborative environments. Supports dynamic delegation with multiple dispatch, several useful datatypes, inline ML, and checkpoint persistence.

Small, embeddable interpreter, mostly Scheme R4RS conformant, with extensions: supports prototype-based object model, some POSIX system calls, compilable in secure mode.

By Rainer Blome. Alphabetized list with descriptions of, and links to, many prototype-based languages.

Text table compares about 20 languages, with links: Agora, Amulet, Cecil/Vortex, Cel, Garnet, GlyphicScript, Io, JavaScript, Kevo, Lua, Merlin, Moostrap, NewtonScript, Obliq, Omega, OScheme, Poe, Self, SK8.

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

Language-OS based on CLOS, Self, Smalltalk; Smalltalk syntax; libraries inspired by Common Lisp, Dylan, Strongtalk (strong typing). Descriptions, programming manual, tutorials, summaries, bulletin board Swiki, CVS. [Open Source, LGPL]

Brief description with many forum comments. [Slashdot]