TclMacBag - A bag of Mac widgets for Tcl/Tk
Features
This Tcl/Tk extension allows developers to use attractive Mac styled widgets, knowing they'll be rendered platform
appropriately on other platforms like Windows and X11.
It shares Ttk/Tile's goal of a developer using one command in their code and the result appearing native on the platform it's running on.
See the Widget Shots Gallery for a sample of what's available.
Features:
-  Written entirely in Tcl and isn't a hook into any operating system APIs or libraries.
-  Greatly reduce the amount of platform-specific UI code.
-  Easily dissectable if you only need one or two widgets from the set.
-  Simple demo scripts with very easy to understand example code.
-  Use with other languages that use the Tk Toolkit: eg,
  Python users report that TclMacBag is
  "particularly easy to install" using
  Tkinter.
-  Convenience global vars for inter-widget spacing, etc, appropriate per platform.
This extension package has always been intended as a bridge. It's the author's hope to have swathes of its functionality superceded by improvements to Tk and 
Ttk/Tile over time.
Commands
General Widgets:
-  Combo - Used for item selection (on Mac, a menubutton and menu; elsewhere, a read-only value combobox).
-  Entry - Tile/Ttk's entry and a default popup menu for Cut/Copy/Paste, etc.
-  Flatbutton - On Mac, a flat transparent button whose image darkens when pressed.
-  Groupbox - Mac Groupbox widget.
-  Helpbutton - Platform appropriate Help button.
-  Listbox - Tk listbox widget with Tile focus highlighting.
-  Scopebutton - Specify the scope of an operation, filter or sort values in a data display such as a listbox.
-  Scrollbar - Tk or Ttk/Tile scrollbar, depending on Tile theme.
-  Searchentry - Search entry with user image.
-  Text - Tk text widget with Tile focus highlighting, and a default popup menu for Cut/Copy/Paste, etc.
Style Widgets:
-  Actionbutton - Presents an 'Action' styled menubutton on Mac platforms.
-  PNB - Panther (10.3+) style notebook widget, buttons with a choise of styles.
-  Stylebutton - Mac style toolbar buttons with a choice of styles.
-  Viewbutton - Mac style 'View' buttons with a choice of styles.
Disclosure:
-  Dbutton - A button which exposes a hidden frame of your chosing.
-  Ddialog - A button which launches a choice/selection related dialog.
-  Dframe - An image and label which expose a hidden frame directly beneath.
Geometry, Frames and Things:
-  Boxframe - A label-free labelframe without padding.
-  Colorframe - A frame with support for user colours.
-  Scrolledframe - A scrolled frame with Pinstripe support.
-  Toolbar - Toolbar show/hide button in your Mac window decor.
-  Toplevel - A variant with Pinstripe support.
There are some Miscellaneous Resources used internally in TclMacBag which might
also be useful in your apps.
Download
TclMacBag's files can now be found at SourceForge.