Try OpenMRS, It is an open source and has a team of individuals who will help you set it up and guide you through its use. It is also being constantly improved by OpenMRS implementors. www.openmrs.org/download/. Hope it suits your use.
Free but not opensource REDCap is widely used and easy to work with[php & mysql]. Open source, Openclinica is mainly for clinical trails and takes little more infrastructure to maintain[Java,oracle/postgres]. There are quite a few paid ones, If this is for managing hospital data Open MRS fits well, not for clinical studies. My experience REDCap is the way to go.