Here is a list of extra components not included in the base or contrib libraries (yet).

Tapestry 5

Tapestry 4

alternative date component using three text fields. Found in tapestry-user archive
decoupled date picker - there are two versions of this component.
- The older component known as DecoupledDatePicker uses the base calendar script. It is found in tapestry-user archive
- A newer version known as the DateTimePicker uses a text based calendar script (Look and feel is totally different). It is part of the component library available at http://myworkspace.sourceforge.net/
Calendar, valid DatePicker and valid TextArea components. http://www.clever.co.nz/resources.html
There's a bunch over at the tapestry deli (http://www.t-deli.com/)
A repository of nearly 30 components and other tapestry-related code is also available at a site called Tassel. http://www.tapestrycomponents.org/Tassel/app
More components, that I found by searching http://sourceforge.net are: TapFX, Tapestry-Bayeux
Krysalis Menu - drop down menu component. Available at Krysalis Also available from Tassel.
Tacos Library. Tacos provides high quality components for Tapestry, such as a Tree/DatePicker/ProgressBar/Autocomplete fields/etc.. It also provides a substantial amount of support for using ajax logic with tapestry and is quickly growing each day.
Captcha

Tapestry Palette plugin for Eclipse. A tool to enable drag & drop Tapestry component editing in the Eclipse IDE.