Friendly Reminder is described as 'A seriously simple personal CRM. Friendly Reminder will email you reminders to get back in touch with the friends you tend to loose touch with' and is an website in the Office & Productivity category. There are five alternatives to Friendly Reminder, not only websites but also apps for a variety of platforms, including Mac, Self-Hosted solutions, Google Chrome and SaaS. The best alternative is Monica, which is both free and Open Source. Other great sites and apps similar to Friendly Reminder are Dex (Freemium), BusyContacts (Paid), Cisdem ContactsMate 5.6.0 (Freemium) and Keep My Friends (Paid).
Dex is a personal CRM designed to be much easier than a sales CRM. Dex reminds you to keep in touch with the people you care about. Easily visualize, understand, and manage all your relationships for free.
Cisdem ContactsMate can analyze, report, fix dozens of problems with OS X Contacts and export Mac Address Book to some formats for backup or sync. It also can make groups for contacts, batch fixes similar problematic contacts, manually set suffix.