The application is freely available in Google Play at the following link. A brief description can be seen in this video.
The application was introduced in the following publication: Serrancolí, G; Bogatikov; P; Tanyà Palacions, G; Torner, J; Monllau, J.C., Perelli, S. An Open-Source Android Application to Measure Anterior–Posterior Knee Translation. Appl. Sci. 2020, 10(17), 5896. https://doi.org/10.3390/app10175896