Bitrix24 Open Source [upd] 〈100% ESSENTIAL〉

License: GPLv3 SuiteCRM is a fork of the once-famous SugarCRM. It is the most feature-rich open-source CRM on the market.

The on-premise version is built to handle massive workloads: run as many business processes as you need, create unlimited CRM entities, and send as many requests as required. It will never lag and ensures stable performance even with thousands of employees across multiple continents. bitrix24 open source

Bitrix24 has invested heavily in creating a robust developer ecosystem with genuine open source components. License: GPLv3 SuiteCRM is a fork of the