Tcl provides a portable scripting environment for Unix, Windows, and Macintosh that supports string processing and pattern matching, native file system access, shell-like control over other programs, TCP/IP networking, timers, and event-driven I/O. Tcl has traditional programming constructs like variables, loops, procedures, namespaces, error handling, script packages, and dynamic loading of DLLs. Tk provides portable GUIs on UNIX, Windows, and Macintosh. A powerful widget set and the concise scripting interface to Tk make it a breeze to develop sophisticated user interfaces. License: BSD License (revised) Changes: A new Tk look and default fonts on X11. Continued Tk demo enhancement and documentation improvements. A fix for broken compilation on x86_64. A fix for a crash and infinite loop in the regexp engine. A [tk_getOpenFile] crash on Mac OS X Leopard has been fixed. Arabic and Hebrew rendering on Windows were added, and performance improvements were made.

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