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Adds a button field type for use with any fieldable entity type integrated with Rules. When the button is clicked, a Rules event is triggered allowing you to do actions such as display a message to the user, alter some data on the entity (or another entity) or reload the current (or any other) page. The module provides two different widgets: HTML Button and Image Button. It adds a new button click event, clicked button comparison, and reload page action for use with rules.

Atrium Invoices is a feature for Open Atrium that allows users to create, view, and pay invoices through the OpenAtrium interface.

Allows users to pay invoices via Paypal. No SSL certificate required.

Firebug for Drupal themeing. See the screenshot and screencast. Note that this module injects markers into the DOM to do its magic.

Colorbox is a light-weight customizable lightbox plugin for jQuery. This module allows for integration of Colorbox into Drupal.