You can use free support via the Forum and the Wiki Documentation system.

If this is not sufficient for your organization, there is Professional Services available.
osFinancials has it's own support team which is in direct contact with the development team.

Professional Services are based on a support contract or support tickets, please note that these are payed services!
For more information see the support teams webpages: http://www.osfshop.com/support-c-4.html?language=en