AddThis is a social bookmarking service that can be integrated into a website with the use of a web widget.
Websites that have a shopping cart or checkout page, either using a known ecommerce platform or a custom solution.
ExoClick is a Barcelona-based online advertising company, which provides online advertising services to both advertisers and publishers.
Nginx is a web server that can also be used as a reverse proxy, load balancer, mail proxy and HTTP cache.