InStream CRM - Business relationship management platform - CRM alternative
Pipedrive - Sales pipeline software that gets you organized. Helps you focus on the right deals, so easy to use that salespeople just love it. Great for small teams.
Gmail CoPilot by cloudHQ - Easy CRM: View all past conversations with an email contact
Zoho CRM - Omnichannel CRM for Businesses of all sizes
Crmble - Easy peasy crm for Trello
Freshsales CRM - A full-fledged CRM for high-velocity sales teams.