heroku auto deploy
NOTE: Travis-ci has builtin support for this.
Heroku is one quite popular Platform as a Server (Paas), supporting most popular frameworks, such as Ruby on Rails, Node.js, Django, etc. Developers could deploy their apps using git, which most developers use for version control. Therefore, the integration is quite smooth. Meanwhile, as for open source projects, developers usually put the source in one code hosting provider, such as bitbucket or github. Then, is it possible to auto pull the latest code from one code hosting provider and deploy without developers' intervention.
Therefore, we would like to build one web service to provide this monitoring functionality, so that developers could just push source code to the code hosting provider. Then the code hosting provider notifies the web service. Finally, the web service pulls the latest source code, and deploys it.