Off the top of my head: GCC, Emacs, coreutils, sed, grep, find, parallel, Guile, Coreboot, GNOME, GIMP, GnuPG, Bash

In each case, development is the work of the developers, and they themselves deserve most credit. But the FSF and the GNU project have certainly been involved with lots of software that is important, widely used, and works well.

GNU software is still responsible for huge and often critical chunks of the stack in most Linux distros.