Node timer measures the time that users need to read content (nodes). Node time can be activated on individual content types. You can also define which roles get tracked by the system.
Drupal Test Notifier is a user script for your browser that notifies you when an automated test (a.k.a SimpleTest) has completed. This allows you to go about your other business without checking back on the tab running your tests every few seconds waiting for it to complete. It also saves you from forgetting that you had a test running while you go about your other business.