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.
The API can either be used online or downloaded and executed locally.
An open version of the API is available, visit the API docs section to see what can be done with it.
To try it a set of Google Sheets scripts have been developed. The scripts are also available at GitHub
Implemented by Josep Rubió Piqué.