The best open-source Referral Affiliate tools, curated: 3 in the registry, including RefRef, RefearnApp, Refferq. Every tool is open-source; each entry lists license, self-hostability, and links.
RefRef· tool, 2026-09-15 Open-source (AGPL-3.0), self-hostable platform for referral and affiliate programs: JavaScript tracking snippet for attribution, customizable rewards with manual or automatic dispersal, referrer and partner portals, fraud monitoring, analytics and a sandbox. Purpose-built for the niche; still alpha — expect breaking changes.