CalyxOS (currently up in the air): Nicholas Merrill ran a New York-based web-hosting company called Calyx when he received documents from the FBI demanding information on his service users. He not only refused to comply, but also sued the FBI – and won. He then set up the Calyx Institute, a non-profit organisation. CalyxOS is a mobile operating system with privacy and security in mind that runs on specific devices such as Fairphone and Pixel, if you can grab a used one to avoid financing Google. Sadly, for reasons unclear, Nick’s just recently parted ways with the Calyx Institute since I originally compiled this list, and security updates are paused, so personally I switched to the comparable iodéOS: https://iode.tech