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.

Listmonk - Send e-mail campaigns from a powerful dashboard. High performance and features packed into one app.

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.

Mailman - Mailman is free software for managing electronic mail discussion and e-newsletter lists.

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

Sendy - Sendy is a self hosted newsletter app that sends emails 100x cheaper via Amazon SES