Prototype-based languages are object-oriented languages where the distinction between classes and instances have been removed:

• ABCL/1
• ABCL/R
• ABCL/R2
• ABCL/c plus
• ActionScript
• Agora
• Cecil
• ECMAScript
  • ActionScript
  • DMDScript
  • E4X
  • JavaScript (first named Mocha, then LiveScript)
  • JScript
• Etoys in Squeak
• Io
• Lisaac
• MOO
• NewtonScript
• Maple
• Obliq
• REBOL
• Self (the first prototype-based language, derived from Smalltalk)
• Slate
• TADS

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Off-side rule languages are those where blocks are formed, indicated, by their indentation.

• ISWIM, the abstract language that introduced the rule
• ABC, Python’s parent
  • Python
    • Cobra
• Miranda, Haskell’s parent
  • Haskell
    • Curry
• Occam
• Pliant
• SPIN
• XL

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• ARLOGO – Arabic
• Chinese BASIC – Chinese
• Fjölnir – Icelandic
• HPL – Hebrew
• Lexico – Spanish
• Rapira – Russian
• Glagol – Russian

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Class-based Object-oriented programming languages support objects defined by their class. Class definitions include member data. Message passing is a key concept (if not the key concept) in Object-oriented languages.

Polymorphic functions parameterized by the class of some of their arguments are typically called methods. In languages with single dispatch, classes typically also include method definitions. In languages with multiple dispatch, methods are defined by generic functions. There are exceptions where single dispatch methods are generic functions (e.g. Bigloo‘s object system).

Multiple dispatch

• Common Lisp
• Dylan
• Goo
• Cecil

 Single dispatch

• Actor
• Ada 95 (multi-purpose language)
• BETA
• C++
• C#
• Chrome
• ChucK
• Cobra
• ColdFusion
• Corn
• Curl
• D
• DASL
• Delphi
• E
• eC (Ecere C)
• ECMAScript
  • ActionScript
  • DMDScript
  • E4X
  • JavaScript
  • JScript
  • MDMscript
• Eiffel
  • Sather
  • Ubercode
• F-Script
• Fortran 2003
• Fortress
• GML(Game-Maker-Language)
• J
• Java
  • Groovy
  • Join Java
  • X10
• Kite
• LabVIEW
• Lava
• Lua
• Modula-2 (data abstraction, information hiding, strong typing, full modularity)
  • Modula-3 (added more object oriented features to Modula-2)
  • Objective Modula-2 (Modula-2 with Smalltalk message passing, following the Objective-C object model)
• Moto
• Nemerle
• NetRexx
• Oberon-2 (full object orientation equivalence in an original, strongly typed, Wirthian manner)
• Object Pascal
• Object REXX
• Objective-C (a superset of C adding a Smalltalk derived object model and message passing syntax)
• Objective Caml
• Oz
  • Mozart Programming System
• Perl 5
• PHP
• Pliant
• PowerBuilder
• ppC++
• Prograph
• Python (object oriented interpretive language)
• Revolution (programmer does not get to pick the objects)
• Ruby
• Scala
• Simula (the first object oriented language, developed by Ole-Johan Dahl and Kristen Nygaard)
• Smalltalk (pure object-orientation, developed at Xerox PARC)
  • Bistro
  • F-Script
  • Little Smalltalk
  • Squeak
    • Scratch
  • VisualAge
  • VisualWorks
• SPIN
• SuperCollider
• VBScript (Microsoft Office ‘macro scripting’ language)
• Visual Basic
• Visual DataFlex
• Visual Foxpro
• Visual Prolog
• XOTcl

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• Algae
• Seneca an Oberon variant

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