Quantra is a JSON API wrap for QuantLib. Its aim is creating a simple interface for QuantLib functionalities making its integration with other systems easier.
An online version of the API is available, visit the API docs section to see what can be done with it. The API can also be built from the sources and executed locally.
Google sheets and web client
A set of Google Sheets scripts that use the online API and hence make some QuantLib functionalities usable from a spreadsheet are available at GitHub. A sample web based client is also available.
Implemented by Josep Rubió Piqué.