Puff - Puff is a secure proxy software & service, it is provided AS IS without any warranty
nginx - A high performance free open source web server powering busiest sites on the Internet.
GAppProxy - GAppProxy is an open source HTTP Proxy software runs on Google App Engine.
AWS Elastic Load Balancing - Amazon ELB automatically distributes incoming application traffic across multiple Amazon EC2 instances in the cloud.
XX-Net - XX-Net is GoAgent with improvements.
Google Cloud Load Balancing - Google Cloud Load Balancer enables users to scale their applications on Google Compute Engine.