tranSMART used to have one user interface, known as transmartApp. With the introduction of the tranSMART REST API the option was opened for many different, powerful tranSMART REST API clients/apps, including user interfaces.
Candidate tranSMART user interfaces will be scored by the tranSMART Project Management Committee on a list of quality metrics before they can be part of official releases.
User interfaces:
Other applications (like a Python or R client) on the REST API can be found on the tranSMART REST API clients/apps page.