STMViewer is oriented for ease of use and quick setup process. There are still some functionalities it lacks, compared to STMStudio, however I'm constantly working to improve it. Currently I'm working on a large update making use of the SWO output that enables new ways of debugging live embedded applications so stay tuned for more!
You can try it right away using the installers in Releases page: https://github.com/klonyyy/STMViewer
Any feedback is welcome!