Let's start with the major cosmetic changes : the KDE and Xfce (default) desktop environments have been updated to v5.20 and v4.16 respectively. They bring a fresh look, but are also more comfortable and increase user productivity.
Some terminals have also been tweaked, which the developers have called the process of 'Kalifying' them.
A new package - command-not-found - has been added to the kali-linux-default superpackage (which carries a core set of tools useful for simple vulnerability assessments). Command-not-found will direct users to executables they might want to install, suggest executables when they mistype their names, or tell users when they enter a command that doesn't exist in Kali.
Kali Linux 2021.1 comes with several new tools:
In a continuation of a project started last year, Offensive Security has also partnered with several other manufacturers to give users early access to specific tools.
Kali NetHunter , the portable penetration testing platform for Kali Linux, now has an upgraded BusyBox engine and updated tools to the latest version (some even completely rewritten).
Finally, there are two new Kali ARM images: one that can be used with virtual machines on Apple Silicon Macs (Apple M1), and another for the Raspberry Pi 400 wireless card.