There are some exceptions, but most of my games are written in C using a home-made engine/framework libsuperderpy based on Allegro 5.
Irreplaceable toolset: Qt Creator, GIMP, Audacity, Inkscape, beepbox.co, Hydrogen, GitLab CI, Docker (for multi-platform CI builds), gdb, clang-tidy, sanitizers and Python + Qt for self-made utils (animation editor/converter etc.).