Apache is a free and open-source cross-platform web server software.
Debian is a Linux software which is a free open-source software.
Friendly Captcha is a proof-of-work based solution in which the user’s device does all the work.
Open Graph is a protocol that is used to integrate any web page into the social graph.
TYPO3 is a free and open-source Web content management system written in PHP.
Varnish is a reverse caching proxy.