@Max, my #1 free tool is Ghostscript. I write everything in postscript. Can move data between expressPCB and KiCad. View 40 year old pictures of mars, and read the binary pipe organ definition files for the system I am upgrading. It even manages MIDI too.
Drones are, in essence, flying autonomous vehicles. Pros and cons surrounding drones today might well foreshadow the debate over the development of self-driving cars. In the context of a strongly regulated aviation industry, "self-flying" drones pose a fresh challenge. How safe is it to fly drones in different environments? Should drones be required for visual line of sight – as are piloted airplanes? Join EE Times' Junko Yoshida as she moderates a panel of drone experts.