UPDATED v1.8. Hotbox for Nuke, similar to Autodesk Maya's. Selection specific menu that appears underneath your cursor for as long as you press the shortcut. Fully customizable, with interface to easily add and modify buttons on the fly. See the video in the description for a demonstration.
Just drag and drop gizmos into the right folder and they will show up in your Nuke menus. No longer will you have to create the menu items manually for each gizmo you want to install.
a better search and replace panel
Allows you to quickly bind keyboard shortcuts to existing menu items without writing Python code
Generate ease curves and wave expressions with just a right-click on any animatable value in Nuke. Live animating previews in dialog.
A panel to keep track of tasks for a shot
a panel to convert between fov, aperture and focal length
Easy way of changing layer inside the viewer.
Alternative 'tab node creator thingy', with substring matching and weighting
UPDATED v1.3 - Floating script editor for python and callback knobs, with features like syntax highlighting or line numbers, to make scripting inside of Nuke less painful.