ETS is a file format native to Enthuware Test Studio, an integrated development environment that allows users to create certification exams.

ETS is an exam project created with Enthuware Test Studio. The tool can be used to help prepare for certification exams. ETS files can be viewed with ETS Viewer, but in order to open them a tool called ETS Editor must be used. Both application require Java and JDK 1.6 or newer.