I primarily use C, but C++ when the platform/compiler supports it.

I do mostly games and graphical demos on a wide range of exotic and retro hardware, which always has a C compiler, but not always a compiler that supports C++. Also, i feel like i have more control over every bit and clock cycle in C than in C++, although i know it’s technically possible to use C++11 on a Commodore 64.

On projects where i can use C++ i use the following tools: CMake, Clion (IDE), Catch2 testing framework. Often ImGUI for quick debugging UIs.