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Tcl (Tool Command Language) is used by over half a million developers worldwide and has become a critical component in thousands of corporations. It has a simple and programmable syntax and can be either used as a standalone application or embedded in application programs. Best of all, Tcl is open source so it's completely free. Tk is a graphical user interface toolkit that makes it possible to create powerful GUIs incredibly quickly. It proved so popular that it now ships with all distributions of Tcl. Tcl and Tk were created and developed by John Ousterhout. Developers all over the world followed his example and built their own Tcl extensions. Today, there are hundreds of Tcl extensions for all manner of applications. We have cataloged hundreds of of these contributions, which you can find listed under our Applications, Extensions, and Tools. Tcl and Tk are highly portable, running on essentially all flavors of Unix, (Linix, Solaris, IRIX, AIX, *BSD*, the list goes on and on) Windows, Macintosh, and more. There are several sites that provide precompiled binaries for various platforms that are listed under our Tcl/Tk Ports area. Tcl/Tk 8.3 is the stable version of Tcl/Tk. We've added a number of features that make Tcl the pre-eminent scripting language for enterprise applications. These are described on our Whats New page. Tcl/Tk 8.4 is the latest development version of Tcl/Tk. The Tcl/Tk Web browser plugin provides an easy alternative to Java programming for client-side web applications. The plugin leverages Safe-Tcl to provide a secure environment to run downloaded "Tclets". Tcl and Tk are open source and their ongoing development is a collaboration between engineers at Scriptics and others in the Tcl user community. Scriptics hosts the CVS repository for the source code. Everyone is welcome to submit source code changes. Please use our bug report and patch submission form so we can catalog submissions in our database. Check out the list of contributors to the latest Tcl/Tk release. Select your Tcl/Tk Version Download Tcl/Tk 8.4 The latest development release, 8.4a2, was made November 3, 2000 Download Tcl/Tk 8.3 The current stable release, 8.3.2, was made August 9, 2000 Find out what version of Tcl/Tk is best for you. This page also reviews the features added in Tcl 8.0 through Tcl 8.4. The Tcl/Tk Web Browser Plugin lets you run Tcl/Tk scripts in Netscape Navigator and Internet Explorer. Tcl: The Integration Platform Businesses and engineering teams today are often faced with the problem of making diverse collections of resources work together. We call these programming tasks integration applications. For enterprises, the integration platform is becoming as strategically important as the OS and database platforms. Tcl is the integration platform of choice because of its speed of use, breadth of functionality, and enterprise-ready features such as thread-safety, internationalization and cross platform deployment. The latest version of Tcl provides all the features an enterprise needs for all integration and scripting needs. Tcl Praise John Ousterhout is the 1997 winner of the ACM Software System Award for his work on Tcl. Other winning systems include UNIX, TCP/IP, SmallTalk, the World-Wide-Web, and PostScript. There are thousands of satisfied Tcl developers who use Tcl on a daily basis for very complex integration tasks. Check out some of the many positive comments we received from our developers community. " We use a Tcl interpreter in each of the hundreds of back-end host processes that provide services to Digital City's 4.5 million monthly visitors. Tcl greatly simplifies the task of configuring these services and managing them remotely. " Jim Davidson, Chief Technology Officer, AOL's Digital City. " Tcl is the best scripting language for our mission-critical testing environment, bringing us several advantages. Tcl is easy to use, is embeddable and extensible, and has allowed us to automate our testing tasks to a much higher degree than we otherwise could. " Jay Yang, manager, Automated Test Solutions at Cisco. " Before we began using Tcl, we found that our current development methods and tools for system management were unable to keep up with the pace of change. With Tcl,we find that we can now respond to changes very quickly. " Marc Rossi, member of the GAS development team at NationsBank. More customer quotes. Related Links Information for the New Tcl User Getting Started Page. Introduction to Tcl Programming. Introduction to Tcl Syntax. Information for the Experienced Tcl Developer SourceForge Tcl Foundry The CVS repositories and bug databases are now on SourceForge. Whats New Page that summarises the features that have been added recently. Tcl/Tk Documentation including "How To" guides and the reference pages. Tcl Resource Center catalog of Tcl software and web sites. TclPro that provides an extended Tcl platform and development tools for Tcl programmers. Information for Tcl Evaluators The Tcl Top 10 lists the main reasons why so many developers are relying on Tcl. Tcl Comparison Chart This page has a chart that compares Tcl ith Perl, Python, JavaScript, and Visual Basic. Comparing Tcl and Perl 10 reasons why many people prefer Tcl over Perl. Tcl Success Stories explain how companies use Tcl and why it provides unique value to them. Scripting and System Programming describes how you should decide between a scripting language like Tcl and a systems programming language like C++ or Java. White Papers provide background information on Tcl and Scripting. 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