OpenFaaS is a serverless platform that provides an API gateway for deploying, managing, and invoking functions. The gateway handles HTTP routing to functions, collects and exposes Prometheus metrics, implements autoscaling based on invocation rates, includes a built-in AngularJS UI for function management, and supports alerting via integrations like Slack. It uses a plugin architecture for function providers (e.g., Kubernetes, Docker Swarm) via the faas-provider interface, allowing the core to remain decoupled from the underlying runtime. The system processes synchronous function invocations through a reverse proxy and asynchronous invocations via NATS queues.
Direktiv is a workflow automation and serverless orchestration platform that enables users to define, execute, and manage workflows and services through a web UI or API. The system features a Go-based backend with React/TypeScript frontend, providing namespace-based multi-tenancy, event-driven triggers via CloudEvents and NATS, a plugin-extensible API gateway, and Kubernetes-native service deployment. Key capabilities include workflow execution (YAML/TypeScript), service management, secret/variable storage, file handling, Git-based namespace mirroring, and comprehensive monitoring with OpenTelemetry integration. The architecture follows a microservices-inspired monolith pattern with clear separation between API handling, data storage, execution engine, and gateway plugin systems.