ActiveState

Stackato is a vSphere-compatible, Cloud Foundry-based cloud application platform for creating a private PaaS. It adds support for ActivePython, ActivePerl languages and is available as both a micro cloud and multi-instance scalable private cloud deployments. Established in 1997, ActiveState serves over 2 million open source dynamic language developers, with enterprise customers including Cisco, Juniper Networks, Bank of America, Boeing, Lockheed Martin, and NASA.

AppFog

AppFog (formerly PHP Fog) is a vmc-compatible Cloud Foundry based hosting service for several popular web application stacks. AppFog was founded in August 2010 and is the creator of PHP Fog, the popular PHP PaaS. In less than a year of operation they have attracted over 20,000 developers to their platform and $10M in venture funding

Joyent

Node.js is an event-driven I/O framework for the V8 JavaScript engine, intended for writing scalable network programs such as data-intensive, real-time (DIRTy), asynchronous, single threaded web servers. Joyent is a global cloud computing software and service provider that offers an integrated technology suite designed for service providers, enterprises, and developers. Joyent is the open source project owner and home to Node's core team