Apache is a free and open-source cross-platform web server software.
AsciiDoc is a text document format for writing documentation, slideshows, web pages, man pages and blogs. AsciiDoc files can be translated to many formats including HTML, PDF, EPUB, man page.
Debian is a Linux software which is a free open-source software.
OpenSSL is a software library for applications that secure communications over computer networks against eavesdropping or need to identify the party at the other end.