KeyLines by Cambridge Intelligence is a JavaScript software development kit (SDK) for building network visualization web components. It uses WebGL and HTML5 Canvas for fast performance and offers a powerful event model and API for data connections. KeyLines is designed for developers with easy-to-follow documentation and example source code. It works in your existing environment, allowing you to keep your servers and code in your preferred JavaScript framework. KeyLines includes a fully-documented API with real-time, dynamic, and geospatial network support. It handles rendering at the front end, eliminating the need for specialist visualization servers and external dependencies or plugins. KeyLines is flexible and can work with virtually any database, visualizing data parsed into JSON format. It offers powerful graph algorithms to help users understand network behavior, structure, and interactions. KeyLines supports high performance with optimized code and WebGL graphic rendering, allowing for quick visualization of large datasets across modern browsers. It has been deployed into hundreds of high-profile applications around the world and includes frequent release cycles with multiple releases each year and patches for enhancements and fixes.