GNU Smalltalk - GNU Smalltalk is a free implementation of the Smalltalk-80 language. It runs on most POSIX compatible operating systems (including GNU/Linux, of course), as well as under Windows. Smalltalk is a dynamic object-oriented language, well-versed to scripting tasks.
Squeak - 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.
Pharo
JSqueak
Potato - Potato is a Squeak virtual machine completely written in Java. It is a derivative of JSqueak.
#Smalltalk
Introducing SABLE

Training Courses

Books

Seaside - 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.
AIDA/Web