ERPNext is a free and open-source integrated Enterprise Resource Planning software. It is a generic ERP software used by manufacturers, distributors and services companies.

SugarCRM is an open source customer relationship management system with following functionalities - marketing campaigns, sales-force automation, customer support, collaboration, Mobile CRM, Social CRM and reporting.

Mautic provides free and open source marketing automation software available to everyone. Free email marketing software, lead management software and more.

Zammad is a web based open source helpdesk/customer support system with many features to manage customer communication via several channels like telephone, facebook, twitter, chat and e-mails.

VTiger is a cloud-based CRM that enables businesses to deliver customer experiences by breaking barriers between their marketing, sales, and support teams.

HubSpot is a CRM platform that brings everything scaling companies need to deliver a best-in-class customer experience into one place. Our crafted, not cobbled solution helps teams grow with tools that are powerful alone, but better together.<br />With HubSpot, customers come first, customization is simple, and teams are connected through a unified CRM.<br />HubSpot offers a better solution that’s crafted, not cobbled. We built our entire platform in-house so our customers can benefit from software that’s cohesive, customizable, and easy to adopt. With a single source of truth, your teams can form deeper relationships with customers throughout their journey. And when the customer is at the center of every business decision, company-wide alignment is a whole lot easier.

InvoicePlane is a free and open source CRM application which is used to manage users quotes, invoicing, payments and customer relations.

Odoo is business management software including CRM, e-commerce, billing, accounting, manufacturing, warehouse, project management, and inventory management.

Sentrifugo is a free and powerful new-age Human Resource Management System that can be easily configured to adapted to organizational processes. It features HR, leave mngt, time mngt, acquisitions, analytics and other functionalities.

OpenProject is a web-based project management system for location-independent team collaboration.

Helpy is an open source customer support platform designed for companies which take care of customer data security and control