Open Source Recruitment Software
Talent acquisition is a thin space in open source, because hiring software earns its keep from job-board integrations and sourcing networks that are commercial by nature, and few projects can sustain those connectors for free. What does exist here covers the part you most need to own - the candidate database, pipeline stages, and hiring-team collaboration - self-hosted, so the relationships and history you build with people stay in your hands even where the outbound sourcing still leans on paid channels.

OpenCATS
Free and open-source applicant tracking system and recruitment CRM for recruiters

Reqcore
Self-hosted open-source ATS for engineering teams, with no per-seat fees and Docker Compose setup

Hire Gnome
Open-source applicant tracking system for small recruiting and staffing teams