Smalltalk Development Systems

VisualWorks    Cincom
http://www.cincomsmalltalk.com

VisualWorks is the direct successor of Smalltalk-80. The abstraction regarding the platform is the most distinctive feature of VisualWorks. Platform peculiarities are an integral part of the virtual machine. This allows an image to be executed on all supported platforms without any alterations. These platforms are Windows, Macintosh, Linux and many other UNIX systems. VisualWorks is available in a non-commercial version with similar conditions to ObjectStudio.

ObjectStudio    Cincom
http://www.cincomsmalltalk.com

ObjectStudio is a Smalltalk development system that is exclusively available for Windows. It has a port to each standard databank on private and native drivers as well as legacy systems (such as CICS, MQ Series, APPC and EHLLAPI) which makes it ideal for connecting existing mainframe systems to a modern user interface. ObjectStudio is available in a non-commercial version without time or feature limitations.

VA Smalltalk    Instantiations
http://www.instantiations.com/products/vasmalltalk/index.html
http://www.instantiations.com/support/version-history.html

VisualAge was probably one of the most popular Smalltalk systems, developed and distributed by IBM based on the cross-language development platform VisualAge. In 2005, on-going development was handed over to the company Instantiations, which distributed it under the name of VA Smalltalk. VA Smalltalk provides many various components, for instance interfaces for databases, various transaction processing monitors other IBM server services and can be integrated into a Java environment via RMI. VA Smalltalk is still fully compatible with VisualAge for Smalltalk and supports the latest versions of the operating systems Windows, Linux, Solaris and AIX.

GemStone/S    GEMTALK SYSTEMS
https://gemtalksystems.com/
https://gemtalksystems.com/licensing

Initially, GemStone/S was developed by GemStone Systems and later it was sold to GEMTALK SYSTEMS who still distribute and develop it further. GemStone/S is a Smalltalk-based development platform that provides a highly scalable, high performance database server, which supports various Smalltalk systems as well as Java as clients. GemStone/S uses the same object models as Smalltalk, which ensures a seamless integration in Smalltalk clients. Objects and classes can be moved easily between client and server. GemStone/S is available as a free version without a time limit for Linux with certain functional restrictions.

Pharo Smalltalk
http://pharo.org/

Pharo is a free open source project for a clean and innovative Smalltalk environment. It is meant to achieve an attractive platform that creates "mission critical" Smalltalk applications based on a stable, small core system and excellent development tools

Squeak
http://www.squeak.org/

Squeak was developed as a free Smalltalk-80 implementation by a group led by Alan Kay, one of the fathers of Smalltalk at Apple and later at Disney. The virtual machine itself is implemented in Squeak, making it easy to maintain and port to new platforms. In Squeak, new concepts in dealing with computers are developed. This applies above all to user guidance and the handling of multimedia data. A very active user community, similar to that of Linux, has formed around Squeak, which drives the development of Squeak.

Smalltalk/X    eXept Software AG
http://www.exept.de

Smalltalk/X is a Smalltalk system, which as a specialty contains a translation from Smalltalk to C, with which real DLLs or "shared libraries" can be created. Another special feature is the incorporation of inline C code directly into the method source code for connecting external C/C++ procedures or for tuning time-critical code. Smalltalk/X is available for Windows and most UNIX systems and can also be used commercially without license fees.

GNU Smalltalk
http://smalltalk.gnu.org/

GNU Smalltalk is a free, non-commercial implementation of Smalltalk-80. The first version was already available in the mid-80s and is currently under further development. Although GNU Smalltalk has a graphical user interface, the main application area as well as the direction of development are, in fact, server programs and scripts. GNU Smalltalk resembles the more classical script languages such as Perl or PHP. GNU Smalltalk runs on all UNIX systems with POSIX-compatible libraries.

Little Smalltalk
https://en.wikipedia.org/wiki/Little_Smalltalk
http://www.edm2.com/index.php/Little_Smalltalk

Little Smalltalk is a small experimental Smalltalk system aimed at writing the most minimalistic Smalltalk applications. The VM consists of only around 1800 lines of source code. Little Smalltalk is a minimalistic system that is easy to understand and extend. Little Smalltalk is free for non-commercial use. 

Smalltalk/JVM    Mission Software
http://missionsoft.com

Smalltalk/JVM seamlessly integrates Smalltalk with Java. It compiles Smalltalk classes in Java class files, which can be loaded into every Java virtual machine. Smalltalk and Java classes thus exist in a parallel manner within the same virtual machine and communicate with each other. Smalltalk/JVM provides only a few of its own components because it has full access to the SDKs, available with Java, and these can therefore be used on separate applications. A free, non-commercial Windows version can be downloaded from the web address. Additionally, SUN JDK 1.3 and the Sun Java Servlet Development Kit are required.

Dolphin Smalltalk    Object Arts
https://github.com/dolphinsmalltalk
https://www.i-programmer.info/news/98-languages/9309-dolphin-smalltalk-goes-open-source.html

Dolphin Smalltalk is one of the newest Smalltalk systems and is exclusively available for Windows. Interfaces for all common Windows components such as ODBC, OLE, COM, ActiveX, DirectX, and so on are integrated into Dolphin Smalltalk. The user's guide for Dolphin Smalltalk is based on the common and known development systems in Windows in order to ease the transition for the developer. Dolphin Smalltalk is available in a trial version with time limitations.

Smalltalk MT    Object Connect
http://www.objectconnect.com/

Smalltalk MT demonstrates the most consistent integration into the Windows platform and is also only available for Windows. With Smalltalk MT, native Windows applications as well as DLLs and ActiveX Controls can be created. With direct integration and the usage of Windows functionalities, programs can be created with low resource requirements. Smalltalk MT is available in a trial version with time limitations and can be downloaded from the Object Connect online server.

PocketSmalltalk
http://wiki.c2.com/?PocketSmalltalk

PocketSmalltalk is a free Smalltalk development environment that translates Smalltalk applications into the binary format of the Palm OS. The generated applications are real Palm OS applications that run well without a virtual machine and therefore consume less storage space. PocketSmalltalk exists in two versions. The most updated version is currently based on Dolphin Smalltalk and is only available on Windows platforms. The other version is realized in Squeak and is available on a number of platforms.

Smallscript
Discussions:
http://wiki.c2.com/?SmallScript

Smallscript sets itself apart from the other Smalltalk systems through its distinctive script character. Smallscript allows the creation of applications with graphical interfaces; however, the main application areas are server applications and Smalltalk scripts. Smallscript is no longer in development.

SharpSmalltalk and #Smalltalk
http://www.refactory.com/tools/sharp-smalltalk

SharpSmalltalk runs Smalltalk under .Net framework.