Hudson is a web-based continuous integration (CI) tool written in Java. Main users of Hudson are SMEs and large companies, as well as well-known brands, such as eBay, Hewlett-Packard, MySQL, JBoss, Xerox, Yahoo, LinkedIn, and Goldman-Sachs. It is known for ease of use and broad extensibility. Continuous Integration means that members of software development team can integrate their work regularly several times per day. As for Hudson, this tool is written in Java, and runs in a servlet container, such as Apache Tomcat or the GlassFish application server. However, it is not restricted to the Java world: Many companies use Hudson to automate their software development in C/C++, C#, PHP, Groovy, Scala, and many other languages. Hudson is part of the open source Eclipse Foundation.