Wobaka - Refreshingly Simple CRM And Email Automation
Onesheet CRM - The Simple CRM for Google Sheets
Salesflare - Simply powerful CRM. Automates your data to build better relationships and make more sales.
Followup.cc - FollowUp for email is a lightweight productivity suite that keeps your conversations and tasks from slipping through the cracks. Set perfectly timed reminders that arrive at the top of your inbox, right when you need them.
Streak - Manage customers inside Gmail
Freshsales CRM - A full-fledged CRM for high-velocity sales teams.