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Highlights of Tcl 8.5

  Speed: 8.5 now runs 10% faster than 8.4 with bytecode improvements, object caching and reduced memory usage. 

  Bignums: Tcl now supports arbitrary-precision integers, which improves math operations on large integers. 

  Safer interps: Tcl's powerful safe interpreter mechanism now has improved control of time and command limits in slave interpreters. 

  clock command: More robust implementation of command for specifying time, with significant l10n and i18n improvements. 
  dict command: New data structure that allows access to data by value rather than a variable name, which is substantially faster. 

  Additional improvements: Faster list search, new and improved mathematics procedures, anonymous procedures,
  new ways to package Tcl extensions, Tcl-level custom channel types, file and line location information for each command, and more. 


Highlights of Tk 8.5

  New modern theming engine: New and complementary widgets that make use of platform-specific theming 
  on Mac OS X and Windows to better fit in with those environments, and feature an improved look and feel under X11.

  New widgets: Part of the themed widget set, Tk now has core notebook, combobox, treeview and progressbar widgets. 
  text widget: Smooth scrolling, widget peering, and improved procedures for counting and replacing text. 

  Font rendering: Now uses anti-aliased text under X11, and a more modern text engine (ATSUI) on Mac OS X. 

  Additional improvements: Window transparency, new fullscreen option for windows, enhancements to specific widgets and window layout, and more. 

There is of course much, much more. See 8.5 Changes on the wiki for a complete list of new features.