Clearbit - Clearbit provides Business Intelligence APIs

InsightSquared - #1 for Salesforce.com Pipeline forecasting, profitability analysis, activity tracking: all the small business intelligence you need. Works using CRM data and automatic syncing.

Lead411 - Lead411 is the Top B2B Marketing & Sales Intelligence data platform for prospecting, contact enrichment, Bombora intent and list building. Get Verified Emails, Direct Dials and Company Intel to improve your sales pipeline.

Aviso - Aviso provides predictive analytics software to help sales organizations optimize their performance and exceed revenue goals using machine learning algorithms and portfolio management techniques.

UpLead - Access our accurate and real time verified B2B database to drive growth. With built-in email verification, UpLead is the leader in high quality business contact data. Start your free 7-day trial today!

Sidekick by Hubspot - Customer insight integrated with your email tools.