TLC is a Tcl package created by [Cyan Ogilvie] containing a bunch of Itk based widgets, a simple client / server rpc framework, and a mechanism for building arrays of virtual logic gates for state propagation.  (and probably lots more too - I abuse this as a place to put anything I use all the time)

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Widgets
   * Application - intended as the main window in the application
   * Border - base class for building widgets with a configurable border
   * Browse_treeview_flat - multicolumn listbox (using BLT::Treeview) for displaying the contents of a tlc::Datasource (with the ability to define realtime filters)
   * Calendar - canvas based calendar day selection widget
   * Calpopup - popup window containing Calendar
   * Checkgroup - convenience widget for building a group of checkbuttons
   * Clock - I can't remember.  probably a clock display
   * Comboselect - popup window handler for tlc::Mycombobox
   * Confirm - simple modal dialog box that displays a custom message and waits for the user to peck OK
   * Dateentry - label made to look like an entry, with a lookup button to pop up a Calpopup
   * Datelookup - lookup button for popping up a Calpopup