Smalltalk
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Object oriented, dynamically typed language, was the main development language of IBM application and development software from the late 1980's into the late 90's when Java took over.
A list of OS/2 implementations of SmallTalk
- ChapMan - Commercial - Discontinued
- Enfin/2 - Commercial - Discontinued
- IBM VisualAge Smalltalk Enterprise 6.0 - Commercial - Discontinued
- Smalltalk/V PM - Commercial - Discontinued
- Squeak - Open Source - Discontinued
- Visual Smalltalk Enterprise - Commercial - Discontinued