BindPad

Description
BindPad is an addon to make KeyBindings for spells, items, and macros.
You no longer need actionbar slots just to make Key bindings for your macores etc.

BindPad addon provides many icon slots in its frame. You can drag and drop
anything into one of these slots, and click the slot to set KeyBindings.

To use BindPad-

(1) Type /bindpad or /bp to display BindPad frame.
(Also you can find "Toggle BindPad" Keybinding command in standard
KeyBindings frame of Blizzard-UI.)

(2) Open spellbook frame (p), you bag (b), or Macro Panel (/macro).
(Also you can use three mini-icons on BindPad frame to open these windows.)

(3) Drag an spell icon, item icon, or macro icon using left button drag and
drop it onto the BindPad window.
(Maybe you need shift key left button drag if action bars are locked.)

(4) Now you see the icon placed on BindPad frame. Click it,
and a dialog window "Press a key to bind" will appear.

(5) Type a key to bind. And click 'Close' button.

(6) When you want to remove icons from BindPad frame, simply drag away the icon
and press right click to delete it.

Note that KeyBinding itself will not be unbinded when you delete the icon.
To unbind it, click the icon and click Unbind button on the dialog window.
Also you can simply override Keybindings.