Horilla
A self-hosted Django HRMS covering recruitment, payroll, attendance and performance, all free under LGPL-2.1. No module is paywalled; only SSO and managed hosting sit behind a paid tier.
Human Resources (HRM)
Category: Human Resources (HRM) under Business Operations
OrangeHRM
GPL-3.0 self-hosted HR management system for employee records, leave and time tracking. The free Starter edition covers core HR, but external API access, payroll connectors and advanced recruitment are gated to a paid tier.