We have built an extension for RapidMiner Studio -- if you are a RapidMiner user, install the Rosette Text Toolkit from the marketplace, and paste your Rosette API key into a connection in the "Manage Connections" dialog. The Rosette Text Toolkit offers most endpoints of the Rosette API as easy-to-use RapidMiner operators.
The Rosette API is also available in ProgrammableWeb and Mashape.
We also have a Postman Collection to download and easily run each endpoint of the Rosette API. Just set the value of an API-KEY environment variable as your Rosette API key and run the examples within that environment.