Open Source API Gateway
A gateway sits at the edge of everything you publish, so it reads every request before your services do, holds the auth, and becomes the single hop that can take all your APIs down at once - which makes the routing, rate-limit, and token logic too consequential to run as a black box. The open source gateways here let you read exactly how traffic is matched, throttled, and authenticated, and run that edge on your own infrastructure, so the layer fronting your backends isn't itself a cloud dependency you can't move.
Traefik
HTTP reverse proxy and load balancer that configures routes dynamically from orchestrators and service registries
Kong
Cloud-native API, LLM, and MCP gateway with plugin-based traffic control
NGINX
Event-driven web server and reverse proxy that load-balances HTTP and TCP/UDP, and caches content
Envoy
Cloud-native edge, middle, and service proxy for microservices and containerized apps
Apache APISIX
Dynamic, real-time API gateway with AI proxying, load balancing, and traffic control
Tyk
Open source API gateway for REST, GraphQL, TCP, and gRPC with rate limiting, auth, and analytics
Ocelot
.NET API gateway for service-oriented systems that need a unified HTTP entry point
Kgateway
Kubernetes API gateway built on Envoy and the Kubernetes Gateway API
Envoy Gateway
Open source Envoy Proxy gateway for standalone or Kubernetes-based API traffic management