@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.
What are the engineering and design challenges in creating successful IoT devices? These devices are usually small, resource-constrained electronics designed to sense, collect, send, and/or interpret data. Some of the devices need to be smart enough to act upon data in real time, 24/7. Specifically the guests will discuss sensors, security, and lessons from IoT deployments.