The apps.json file holds Application Descriptors for TMT applications which can be consumed using Coursier. To use these descriptors, add the path of raw apps.json file as a channel as shown below.
cs launch --channel https://raw.githubusercontent.com/tmtsoftware/osw-apps/master/apps.json <app to launch>:<version|SHA>
A more convenient way would be to add apps.json file into the cousier channels. Execute the following command to do so.
cs install --add-channel https://raw.githubusercontent.com/tmtsoftware/osw-apps/master/apps.json
After adding the channel, Cousier will look into saved channels to find the application descriptors whenever needed.
cs launch <app to launch>:<version|SHA>