The Apache HTTP Server, the web server that carried the early web and has served a huge share of all websites continuously since 1995. Its permissive licence and module architecture set the template for collaborative open source infrastructure, and gave the Apache Software Foundation its name.
The Preservation Rating scores how well this entry is archived — not how good the software is. It's calculated automatically from what's already on this page: working mirrors, documentation, a reproducible build, a clearly identified license, and complete metadata. Nothing here is entered by hand; it updates itself whenever the entry changes.
