The MGH Biostatistics center primarily works with two clinical electronic data capture systems: Vanderbilt's REDCap and ScienceTRAX's StudyTRAX. They differ in ease of setup, feature richness and complexity and are intended for different purposes.
REDCap is intended for smaller studies while StudyTRAX is intended to host more complex and long running trials. Both are provided to researchers through Partner's Research Computing. Both allow users to create their own forms, using skip logic and basic validations. Both support user-defined data extracts.