This is a list of modules which extends Rules
Conditional Rules
http://drupal.org/project/rules_conditional
Rules Dev Comments
http://drupal.org/sandbox/onkeltem/1719474
Views Rules
http://drupal.org/project/views_rules
EFQ Rules
https://www.drupal.org/project/rules_efq
Rules Links
https://drupal.org/project/rules_link
https://drupal.org/project/rules_linkevent
Entity Rules
Provides the ability for users to assign Rules Components to Entity Events without having to access to the Rules admin screens. This allows admins and sitebuilders to empower other users decide when Rules should be triggered without out giving them access to the Rules Admin.
https://drupal.org/project/entity_rules
Rules Switch User
Adds two new Rules actions: Switch to another user and Switch back from another user.
Useful when you have an operation that you want an unprivileged user to use but it fails because the user doesn't have sufficient permissions.
Resolves rules and scheduled rules/components triggered by cron issues i.e actions fail because cron runs as an anonymous user and the actions require higher privileges. Create a user called 'cron', allocate this user approprate permissions, add the above actions to your rule/component and away you go.
https://www.drupal.org/project/rules_switch_user
Rules Once Per Day
Easy way to enable Rules to be fired once per day at, or soon after, a specific hour. Simpler than scheduling rules.
https://www.drupal.org/project/rules_onceperday