To run YouTrack as a standalone process, you need Java 1.5+ pre-installed.
The latest version of Java is available for download on its official site.
Execute youtrack-xx.jar using the following command:
java -Xmx256m -jar youtrack-xx.jar <port>
where -Xmx256m sets default Java heap size to 256 Mb and port sets HTTP port number.
We recommend that you increase Java heap size as your database grows.
See also:
Track with pleasure!