Two-week free trial, then $18–$40 per month

FollowUp.cc helps you manage and organize your Gmail accounts. This Chrome browser extension lets you hit the snooze button on new e-mails (and return to them on a date and time you designate), schedule e-mails to be sent later and set reminders to follow up with a contact or a message thread. Being able to see who’s opened or clicked on an e-mail allows users to track whether parents have received tuition reminders and share important information with faculty.