dotProject is a volunteer supported Project Management application. There is no "company" behind this project, it is managed, maintained, developed and supported by a volunteer group and by the users themselves.
The software is free to anyone who would like to download it. Day to day support is provided free by volunteers.
If you are looking for support, to ask a question or to check to see if issues have been raised by others - use the Support forums. PLEASE do not send Private Messages to the site admins or other participants on the site - this just means that you are trying to jump the priority queue, that any answers you received are selfishly then not shared with the rest of the user community OR that you may ask the wrong person who cannot help you. Priority Support is available at a cost - login to the support forums and use your UserCP from there to Subscription details and pricing.