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.
Replay available now: A handful of emerging network technologies are competing to be the preferred wide-area connection for the Internet of Things. All claim lower costs and power use than cellular but none have wide deployment yet. Listen in as proponents of leading contenders make their case to be the metro or national IoT network of the future. Rick Merritt, EE Times Silicon Valley Bureau Chief, moderators this discussion. Join in and ask his guests questions.