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Vertical Tabs module allows you to output form (in our case, node form) fieldsets as vertical tabs. Vertical Tabs Default Tab advances this behaviour, allowing you to move remaining top level node form elements (including, but not limited to title and body) into default vertical tab, leaving only buttons below. This reduces height of node forms, greatly improving usability for complex content types with lots of fields/fieldgroups.
Contains code from #357300: Place all top level form elements into a default vertical tab group.

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.