Nexus Tools is an installer for the Android debug/development command-line tools ADB (Android Device Bridge) and Fastboot for Mac OS X and Linux. The script does not need to be downloaded, simply copy and paste this command into the terminal and run it to install ADB/Fastboot:
Nexus Tools requires sudo privileges to install/uninstall the adb and fastboot tools to /usr/local/bin, so they can be run without typing the full directory. Nexus Tools is licensed under the GPLv3 license, and the source code is at the GitHub project below.
If you have a problem with Nexus Tools, leave a reply below or as an issue on the GitHub project!