A few interesting widgets or experiments with widgets are listed here.

• bqplot a plotting system for the Jupyter notebook based on ipywidgets and d3.js
• PyThreeJS, a low-level scene-graph widget infrastructure for 3d graphics backed by Three.js.
• IPyWidgets, a few small widgets including a webcam widget and a javascript link widget (which evolved into https://github.com/ipython/ipython/pull/6454)
• Leaflet widget infrastructure for embedding maps, adding layers, etc.
• Interactive protein visualization
• Kevin Winters demonstrated some IPython widgets they are using in the Army Corp of Engineers at Sage Days in June, 2014.
• Bootstrap Widgets, an in-progress collection of widgets exposing Bootstrap widgets.
• Widget Mode, allows you to display widgets and cell outputs alone.
• ipython-d3networkx, integration of NetworkX and D3 force directed graphs using the widget framework.
• ipython-d3plot, D3 line and stacked area plots using widgets.
• ipython-gridwidget, widget designed to make grid layouts easy.
• cirq, widget for visually editing circuits of various domains.
• SVG widgets, widgets for drawing SVGs.
• cookiecutter-ipython-widget, a cookiecutter for creating a pip-installable widget
• Turtle widget
• ipython-flightwidgets, widgets that can be used with flight control notebooks, simulators, or other flight related applications.
• gamepad, support for the browser API to gamepads and joysticks (This was recently integrated in the core ipywidgets library).
• static, persistent widgets an experiment with static, persistent widgets backed by a sqlite db. Save states explicitly, and then scroll the slider to restore history.
• NGLView IPython widget to interactively view molecular structures and trajectories.

Projects using widgets

• flotilla Biological data analysis package using widgets