Add-ons that start with the letter P, require jQuery for the Control Panel, are Free and are sorted by Most Recently Reviewed.
Pointee is an ExpressionEngine 2.0 Fieldtype that lets publishers log the x & y coordinates of a single click on an image.
Creates a floating submit button stops one from scrolling back to top of page when filling out long publish forms.
Project Cerberus is an antispam webservice specifically targeting ExpressionEngine member profile spam.
List-making fieldtype with sortable, editable, and deletable rows.
Sliding switch fieldtype with customizable labels and values.
Pill select fieldtype with customizable option labels and values.