GemStone/S - Smalltalk implementation that's been powering mission critical business systems for three decades.
Pharo - Pharo is a pure object-oriented programming language and a powerful environment, focused on...
Python - Python is a clear and powerful object-oriented programming language, comparable to Perl, Ruby, Scheme, or Java.
Julia - Julia is a sophisticated programming language designed especially for numerical computing with specializations in analysis and computational science. It is also efficient for web use, general programming, and can be used as a specification language.
REBOL - Rebol (historically REBOL) is a cross-platform data exchange language and a multi-paradigm dynamic...
V (programming language) - Simple, fast, safe, compiled language for developing maintainable software.