Rallly

Rallly is an open-source group meeting scheduling and availability polling tool for finding the best time to meet — a self-hosted alternative to Doodle. This template deploys Rallly (web UI on port 3000) backed by a managed PostgreSQL database. Rallly is fully database-backed and stateless — all data lives in PostgreSQL, so no persistent volume is required. The DATABASE_URL connection string is composed automatically and SECRET_PASSWORD (used to encrypt sessions) is auto-generated. Update the NEXT_PUBLIC_BASE_URL placeholder to your deployed domain. NOTE: creating and sharing polls works out of the box, but account login uses email magic links — to enable sign-in you must add SMTP settings (SMTP_HOST / SMTP_PORT / SMTP_USER / SMTP_PWD) in the service's environment variables.

Source: GitHub