Now that the new open-source, cross-platform RealSense SDK 2.0 for Windows and Linux has launched, I went through the documentation files and assembled some useful introductory information links. SDK 2.0 is an upgraded version of Librealsense (which has also been referred to in recent times by Intel by the alternate name 'RealSense Cross Platform API').
It is distinguished from the previous version of Librealsense by being identified as being a "development" branch (one that is still in development and may have issues), whilst the older Librealsense version is on the stable "main" branch.
INTRODUCTION AND WINDOWS / LINUX INSTALLATION
DEPTH QUALITY TOOL
DEVELOPMENT BRANCH SAMPLES
DEVELOPMENT BRANCH TOOLS
ADVANCED MODE FOR R415 AND R435 CAMERAS
INTEGRATING EXTERNAL DEVICES WITH R415 AND R435