The AnalyserNode interface represents a node able to provide real-time frequency and time-domain analysis information. It is an AudioNode that passes the audio stream unchanged from the input to the output, but allows you to take the generated data, process it, and create audio visualizations.
IndexedDB is a way for you to persistently store data inside a user's browser. Because it lets you create web applications with rich query abilities, your applications can work both online and offline.
zip.js offers a low-level API for writing and reading large zip files (up to 4GB) with a stable RAM use. It also offers a Filesystem API in order to manipulate zip file structure.
This library is implemented with these HTML5 features:
Web workers
FileReader (and FileWriter optionally)
Blob and BlobBuilder
Typed arrays