Sidekick by Hubspot - Customer insight integrated with your email tools.
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.
HiHello - Exchange contacts, seamlessly.
Zoho CRM - Omnichannel CRM for Businesses of all sizes
Sansan - Sansan provides a internal contact sharing service for companies.
Freshsales CRM - A full-fledged CRM for high-velocity sales teams.