Apache (Internet Software) A free, open source Web Server HTTP processing software package from the Apache Software Foundation. Apache runs on OS/2, NetWare, Unix, and Windows NT. Version 2.0 dates from May 2002. The software source code may be downloaded from the Apache Website, which also contains Apache Documentation. For Apache related questions or issues, you can search this large unofficial Apache Forum hosted by Nabble which currently archives all the Apache projects' mailing lists for cross search and browsing. You can also post your question to the appropriate sub forum which will then forward your post to the corresponding Apache mailing list.