Sidekick by Hubspot - Customer insight integrated with your email tools.
Propeller CRM - Small business CRM with deep Gmail integration
Sansan - Sansan provides a internal contact sharing service for companies.
Cloze - Smarter Relationship Management
HiHello - Exchange contacts, seamlessly.
Highrise - Save and organize notes and email conversations for up to 30,000 customers and contacts. Keep track of proposals and deals.