Debian
Debian Linux is a desktop/window or console (command line) based development environment comprised of some basic programs and utilities. Development can happen directly on the board, and within the OS. While applications and programs can be built directly on the board, they can also be built remotely and cross-compiled for the particular system.
Note: Debian images for the Qualcomm Robotics RB5 platform are currently under development, and can be tested using the links to daily builds below.
Fastboot files