The Apache Software Foundation (ASF) brings a lot of projects under its umbrella when the individual maintainers are no longer able to maintain it but the projects are used by a lot of folks.
The list is quote prolific from databases like Cassandra, CouchDB, languages like PERL, messaging system like ActiveMQ, processing engines like Hadoop and Kafka, UI for applications like Struts, Java application engine like Tomcat and of course what they are most well known for the HTTP Server which is the web server that used to power nearly 80-90% of the Internet for over two decades.
The package 'httpd' stands for HTTP Daemon and that's the web server since the executable is called httpd. HTTP is just the protocol and HTTPS is the secure version of that protocol.