HAProxy offers a load balancing and reverse proxy tool for teams distributing traffic among application servers.
It routes traffic among backends based on health.
When distributing traffic among application servers, fail one backend to verify failover.
Apache HTTP Server offers a web server and module documentation for teams maintaining an existing web server configuration.
Caddy offers a web server and reverse proxy for teams setting up HTTPS and routing for a small site.
Envoy offers a service proxy and observable network layer for teams managing traffic between microservices.