sigrok - The sigrok project aims at creating a portable, cross-platform, Free/Libre/Open-Source signal...
VisaDSO - Your Signal Capture, Storage, Documentation, Presentation, Simulation and Analysis in one Simple Tool.
VS Code - Build and debug modern web and cloud applications, by Microsoft
GazeAtDS1054 - A viewer for the RIGOL DS1054Z (though according to the RIGOL specs, it should work with all MSO1000Z/DS1000Z series digital oscilloscopes) for Linux distros.