Open source alternatives to Insightly

Modern CRM with a spreadsheet-like data model, custom objects and workflows.

Modular business suite whose community edition includes CRM, sales, invoicing and inventory.

Laravel-based CRM aimed at small businesses, with leads, pipelines and quotes.

Full ERP suite covering accounting, inventory, sales, purchasing and HR, with a CRM module for leads and opportunities.

Enterprise CRM descended from SugarCRM Community Edition, covering sales, marketing and service.

Web CRM for leads, accounts, opportunities and email, with a customizable entity model.