Inbox Creature - A super cute virtual pet, delivered right to your inbox.
Freshdesk - Freshdesk is a cloud-based customer support software that lets you support customers through traditional channels like phone and email, social channels like Facebook and Twitter, and your own branded community
Mailtrack.io - The best email tracking solution I've found. Free
Zoho Desk - Industry's first context-aware Helpdesk Software
Tamagotchi Pix - The latest Tamagotchi now with a camera
Salesforce Service Cloud - Service Cloud integrates customer service with social networks and provides a self-service customer portal and knowledge base system.