Apache is a free and open-source cross-platform web server software.
D3 based reusable chart library
HTTP Strict Transport Security (HSTS) informs browsers that the site should only be accessed using HTTPS.
Ionicons is an open-source icon set crafted for web, iOS, Android, and desktop apps.
reCAPTCHA is a free service from Google that helps protect websites from spam and abuse.
Ruby on Rails is a server-side web application framework written in Ruby under the MIT License.