All the major projects have a large number of developers. Linux, BSD, Firefox, KDE, Gnome, Qt, GStreamer, ffmpeg, Mesa, Wine, Blender, VLC, node.js, React, Ruby, Python, Rust, GCC, LLVM, Clang, Debian...
Now, the number of projects is not that important since we are talking about people. In my entirely unscientific estimate, the majority of FOSS developers is mainly active in a project of more than ten people.
Now, the number of projects is not that important since we are talking about people. In my entirely unscientific estimate, the majority of FOSS developers is mainly active in a project of more than ten people.