This is a simple Windows application, which stays in tray and allows to monitor (active/stopped) and manipulate (start/stop/restart) PostgreSQL servers, installed as NT Services in the system.
The pgtrayproject is a PostgreSQL Community project that is a part of the pgFoundry.
The pgFoundry page for the project is at http://pgfoundry.org/projects/pgtray, where you can find downloads, documentation, bug reports, mailing lists, and a whole lot more.