InStream CRM - Business relationship management platform - CRM alternative
Wobaka - Refreshingly Simple CRM And Email Automation
Gmail CoPilot by cloudHQ - Easy CRM: View all past conversations with an email contact
Streak - Manage customers inside Gmail
Zendesk Sunshine - Open, flexible CRM platform built on AWS
Salesflare - Simply powerful CRM. Automates your data to build better relationships and make more sales.