Upcall - Upcall enables you to crowdsource your outbound calls. Collaborate with 1000+ on-demand callers worldwide for sales, marketing and customer support calls. Free trial.
Onesheet CRM - The Simple CRM for Google Sheets
Veloxy - A sales enablement app. Your calendar on steroids!
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 for Mobile - The CRM for Gmail
Freshsales CRM - A full-fledged CRM for high-velocity sales teams.