EspoCRM

No-code-customizable CRM with deep admin, workflows and reports.

EspoCRM is an open-source CRM web application written in PHP with a MySQL/PostgreSQL backend and a single-page frontend. It manages contacts, leads, opportunities, accounts, and activities, and includes a flexible entity manager and workflow engine for defining custom records and business processes without code. It is notable for its self-hostable, extensible architecture and built-in REST API.