Apache is a free and open-source cross-platform web server software.
FreeBSD is a free and open-source Unix-like operating system.
Open Graph is a protocol that is used to integrate any web page into the social graph.
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.
ProcessWire is an open source content management system (CMS) and framework (CMF).