Languages with native ObjC runtime support:

• F-Script, see FScript
• Objective-C, see ObjC
• Objective CLIPS, see ObjectiveCLIPS
• Objective Modula-2, see ObjectiveModulaTwo - still under development
• Objective-Pascal, see ObjectivePascal
• Objective Smalltalk, see ObjectiveSmalltalk - a project by Marcel Weiher, still under development
• Nu - http://programming.nu
• MacRuby, a new version of Ruby that runs on top of Objective-C http://trac.macosforge.org/projects/ruby/wiki/MacRuby
• Eero, An Objective-C dialect with a streamlined syntax, Python-like indentation, and more. http://eerolanguage.org

for languages with Cocoa bridges, see CocoaBridges