Check out the new Kindle book Smalltalk: Messages and Assignment by John Small. ​

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ESUG
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European Smalltalk User Group
ESUG is a non-profit association that gathers all European users of all dialects of Smalltalk.

Cincom Smalltalk

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VisualWorks is a cross-platform implementation of the Smalltalk language with a lineage that goes back to the first Smalltalk-80 implementation by Xerox PARC.

ObjectStudio is a Windows based enterprise centric  Smalltalk dialect.  The latest version is deployed in VisualWorks.

Instantiations

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VASmalltalk is a large business centric product, originally developed by IBM as VisualAge Smalltalk.  Available for Windows and Linux, with Envy, a unique code repository.  

A free trial version is available. 

GemTalk 

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GemStone/S™ is the state-of-the-art platform for developing, deploying, and managing scalable, high-performance, multi-tier applications based on business objects.

Pharo

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Pharo is a clean, innovative, open-source Smalltalk-inspired environment.
  • pure object-oriented
  • runs on all major platforms

  • a clean look and feel
  • good developer tools
  • low memory footprint
  • stable core with large test suite

Squeak

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Squeak is a modern, open source, full-featured implementation of the powerful Smalltalk programming language and environment. Squeak is highly-portable - even its virtual machine is written entirely in Smalltalk making it easy to debug, analyze, and change. Squeak is the vehicle for a wide range of projects from multimedia applications, educational platforms to commercial web application development.

Seaside

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Seaside provides a layered set of abstractions over HTTP and HTML that let you build highly interactive web applications quickly, reusably and maintainably. It is based on Smalltalk, a proven and robust language that is implemented by different vendors. Seaside includes:

Amber

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The Amber language is deeply inspired by Smalltalk. It is designed to make client-side development faster and easier. Amber includes a live development environment with a class browser, workspace, unit test runner, transcript, object inspector and debugger.