| itcl | - object-oriented extensions to Tcl. |
| body | - change the body for a class method/proc. |
| class | - create a class of objects. |
| code | - capture the namespace context for a code fragment. |
| configbody | - change the "config" code for a public variable. |
| delete | - delete things in the interpreter. |
| ensemble | - create or modify a composite command. |
| find | - search for classes and objects. |
| itcl_class | - create a class of objects (obsolete). |
| itcl_info | - query info regarding classes and objects (obsolete). |
| itclvars | - variables used by [incr Tcl]. |
| local | - create an object local to a procedure. |
| scope | - capture the namespace context for a variable. |
| usual | - access default option-handling commands. |
[incr Tk] is a mega-widget package used to construct compound widgets in [incr Tcl].
| itk | - framework for building mega-widgets in Tcl/Tk. |
| itkvars | - variables used by [incr Tk]. |
| Archetype | - base class for all [incr Tk] mega-widgets. |
| Toplevel | - base class for mega-widgets in a top-level window. |
| Widget | - base class for mega-widgets within a frame. |
[incr Widgets] is a widget package built with [incr Tk].