Apache and Nginx are free.
The open-source HTTP server that still serves a lot of shared hosting and VPS sites.
Try itAvailable on almost every VPS and shared host
The config is plain text you can search
No account with a cloud vendor required
You patch and configure the server yourself
A default install is easy to leave too open
Open-source web server, reverse proxy, and load balancer used in front of most production apps.
Try itFree and battle-tested open source
Excellent reverse proxy performance
Huge community and examples (very popular)
Pairs well with Docker and VPS hosts
Can serve static sites on its own
Config files take practice
You manage the server yourself
Advanced features need Plus or extras
Not a full cloud host by itself