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At last count I have 36 repos on GitHub - some private - but by far the one that has been the most useful is my Diminuto (com-diag-diminuto) LGPLv2 repo that is a library of C/GNU/Linux-based functions and tools that provide simpler (for me anyway) APIs for tasks that routinely crop up in the kind of embedded programming I typically do: logging, time keeping, sockets, linked lists, red-black trees, GPIO, threads, etc. It's saved me a lot of time in other C development, both my own side work (e.g. com-diag-hazer), and in several commercial products I've worked on for clients, to have a library that is already unit tested and with which I have years of experience using.

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Related: my Hazer (com-diag-hazer) LGPLv2 repo, which makes extensive use of Diminuto, is my go-to tool for evaluating GPS/GNSS/IMU devices or building geolocation tools. I do use stuff like the GPS Daemon (gpsd) in many of my precision timekeeping projects. But if I need to get closer to the direct output of the device (which is typically the case), step 1 is cloning, building, and installing Diminuto and then Hazer. I find I can only learn and internalize stuff by doing, and Hazer is my mechanism to keep abreast of technology in this field.