MultiWA - Open-source self-hosted WhatsApp API Gateway

Puts multiple WhatsApp clients (whatsapp-web.js, Baileys) behind a single API and pairs that with an admin UI, drag‑and‑drop automation builder, plugin system, and optional AI-powered knowledge base. It’s a practical, feature-rich approach for teams wanting full control of multi-number routing and automations, but low repo activity and few stars suggest you should vet stability and long-term maintenance before adopting.