This might be quite big news! Flutter, the UI toolkit from Google that's used in tens of thousands of Android applications is coming to the desktop. Google and Canonical have announced their push for Linux too.
VibranceGUI, a program on Windows that adjusts the colouring of your games as it's sent to your screen is quite popular and there's a similar project available for Linux. Now it's also not just for NVIDIA.
Over the last year or two more and more toolkits, debuggers and all sorts of handy applications for developers have expanded their Linux support and now NVIDIA are doing the same with NVIDIA Nsight Graphics 2020.2.
SDL 2 (Simple DirectMedia Layer) is the go-to solution for many developers doing cross-platform work, providing an API to hook into audio, keyboard, mouse, joystick, and graphics hardware across various platforms and a big new release is out.