Contact Validator can be used to confirm that a phone number (via Twilio) and/or an email address (via MailGun) is valid and can be used to tag a record if either is invalid.
This feature can be used to dynamically send your contacts to different landing/thank you pages based on criteria you define. It also combines the functionality of Action Links and allows you to apply tags or trigger API goals based on that same criteria.
Contact Creator will allow you to create new contacts based on information pulled from an original contact record. This feature is great for letting contacts register guests and themselves for events.
Video Triggers will tag contacts based on the amount of time the contact has viewed your Youtube playlist. By applying tags at strategic points in a video, you can trigger important follow-up with those contacts.
The cycler is great for when you have multiple lead gen offers, but don't want to flood your contacts with multiple emails a day for separate lead gen opportunities.
Change the status of email addresses for a contact. This is useful if the email address was moved from one field to another and the status changed to Unmarketable due to the move.