qdPM is an open source project management application that is created for small teams in mind.
It is built with PHP/MySQL & relies on Symfony Framework (bundled with the download package).
It has support for adding extra fields for projects, tasks & users which eases customizing the application.
With the multiple task editing feature, it is possible to work with multiple tasks faster.
Projects in qdPM can be set to different billing types like per hour, fixed price, etc. & a powerful reports module helps analyzing these data like any other data in the system.
The application is multilangual & already comes with various language files.