Two nemeses of free and open-source software that affect healthcare informatics are lack of interoperability and vendor lock-in with proprietary systems. Open source software seeks to address issues like these by providing competition to commercial systems and promoting standards-based development. This can help solve problems with healthcare information systems like cost, maintenance difficulties from rapid changes, and issues with security, privacy, and digital consent. Open source healthcare informatics projects aim to create more responsive systems at lower cost through an open development model.