Apache HTTP Server application is most popular open source software developed and distributed by Apache Software Foundation under the apache license. This system is gigantic and resourceful and it currently serves more than 100 million portals. Apache enjoys a cross platform portability and can efficiently work on a wide array of operating systems like Unix, and Microsoft Windows, etc..
Apache also includes extensive web features ranging from providing server side programming language interface to enabling smooth functioning of authentication applications (SSL). The compression methods used on apache adds to its flexibility. The latest releases of this free software are 2.2.27 and 2.4.9