Which are the popular open hardware projects for Amateur Radio?

Amateur radio has a massive and highly active open-source hardware community. Because the hobby is rooted in experimentation and "homebrewing," many of the most popular projects are designed specifically to be built, modified, and repaired by operators at their own workbenches. Here are some of the most prominent open hardware projects across the hobby right now: https://johnsonfrancis.org/techworld/which-are-the-popular-open-hardware-projects-for-amateur-radio/

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