The Amazon Web Services (AWS) are a collection of remote computing services (also called web services) offered over the Internet by Amazon.com.
Launched in July 2002, Amazon Web Services provide online services for other web sites or client-side applications. Most of these services are not exposed directly to end users, but instead offer functionality that other developers can use. In June 2007, Amazon claimed that more than 330,000 developers had signed up to use Amazon Web Services.

Google App Engine is a platform for building and hosting web applications on Google Web Servers. It was first released as a beta version in April 2008. During its preview release, only free accounts are offered. According to Google, a free account can use up to 500 MB of persistent storage and enough CPU and bandwidth for about 5 million page views a month. Google has also indicated its intention to eventually provide additional resources for a price. During the preview stage, Google App Engine tries to accommodate sudden …

GitHub is a project hosting service for projects using the Git revision control system. It is written in Ruby on Rails, being developed by Logical Awesome (Chris Wanstrath, PJ Hyett, and Tom Preston-Werner).
GitHub operates a pastebin-style site at gist.github.com
Used by
Microsoft has created a repository for IronRuby projects, to be hosted on GitHub.
Other notable projects that use GitHub as their hosted revision control platform include: