The commercial ingress controller developed and maintained by F5 NGINX.https://www.nginx.com/products/nginx-ingress-controller/
Alternatives to NGINX:
Contour is an open source Kubernetes ingress controller providing the control plane for the Envoy edge and service proxy.
Emissary-Ingress is an open-source Kubernetes-native API Gateway + Layer 7 load balancer + Kubernetes Ingress built on Envoy Proxy. Emissary-ingress is a CNCF incubation project (and was formerly known as Ambassador API Gateway).
Fast, Reliable and Highly customizable ingress controller based on HAProxy.
The open source ingress controller based on the open source NGINX server and maintained by the Kubernetes community.
An open source ingress controller based on Istio. Not to be confused with Istio's Gateway API, which is recommended to make use of the full feature set that Istio offers.
An open source ingress controller based on Traefik.