AddThis is a social bookmarking service that can be integrated into a website with the use of a web widget.
Google Analytics is a free web analytics service that tracks and reports website traffic.
Mod_rack is a free web server and application server with support for Ruby, Python and Node.js.
Mod_rails is a free web server and application server with support for Ruby, Python and Node.js.
Nginx is a web server that can also be used as a reverse proxy, load balancer, mail proxy and HTTP cache.
PayPal is an online payments system that supports online money transfers and serves as an electronic alternative to traditional paper methods like checks and money orders.
Phusion Passenger is a free web server and application server with support for Ruby, Python and Node.js.
Quantcast Measure is an audience insights and analytics tool.
Ruby on Rails is a server-side web application framework written in Ruby under the MIT License.