Freenters is a Chicago-based ad-tech startup that is turning printing from an ink-guzzling activity to something more valuable and meaningful for college students. Freenters distributes a print driver software that enables students to receive ad pages as they print documents for classes and personal lives. In addition to receiving cash credits for each ad page they print, students can reap the benefits from deals and coupons on the ad pages. More information can be found at freenters.com.