Open Source Nintendo Switch System Software

Atmosphère is an open-source custom firmware platform for the Nintendo Switch that enables advanced system customization, homebrew development, and extended functionality beyond the official operating system. It replaces and modifies key components of the system software, including the bootloader, kernel modules, and system services, allowing developers to hook into and extend system behavior. The project is composed of multiple subsystems such as Fusée for bootloading, Exosphère for secure monitor customization, and Stratosphère for system module extensions. It provides a foundation for running custom applications, modifying system behavior, and experimenting with low-level features of the Switch hardware. Atmosphère is actively developed and updated to maintain compatibility with new firmware versions while improving stability and performance. It is widely used in the homebrew community as a base platform for building tools, mods, and custom applications.