Please check github: - https://github.com/duckduckgo - https://github.com/duckduckgo/zeroclickinfo-fathead - https://github.com/duckduckgo/zeroclickinfo-spice - https://github.com/duckduckgo/zeroclickinfo-goodies

Some of these are listed on our Goodies page: https://duckduckgo.com/goodies/

New plugins are announced on http://twitter.com/duckduckhack

Feedback welcome.