PostgreSQL - PostgreSQL is a powerful, open source object-relational database system.
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.
MySQL - The world's most popular open source database
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.
SQLite - SQLite Home Page
Sidekick by Hubspot - Customer insight integrated with your email tools.