The Fortran stdlib GitHub repository has just surpassed 800 stars.
This puts it in front of the Fortran Web Framework which held that position for a long time, likely also from the exposure it got through HackerNews.
The only project which remains ahead in the star list is the Weather Research and Forecasting Model (WRF) with 936 stars currently. (The projects like gdbgui, cmake-cookbook, and open-mpi, have the “fortran” tag, but aren’t written in Fortran, so they are essentially outliers.)