Dokku

Uses Docker containers to build, run, and manage applications consistently, ensuring environment parity from development to production as highlighted in the Key Features.

Supports git push deployments, buildpacks, and environment variable management, mirroring Heroku's workflow for a familiar developer experience without cloud lock-in.

Aims to be the smallest PaaS implementation possible, minimizing resource overhead and complexity compared to larger orchestration systems like Kubernetes.

Offers plugins for databases (e.g., PostgreSQL), caching (e.g., Redis), and other services, allowing customization without bloating the core system.