It depends on what you want to do. Draftsight is one... Anything in the manufacturing world is gaining in speed. With 3D printers everywhere, it just makes sense. HArdware is free... makerbot supplies a way to make everything.
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.