Here's a list with some of the popular GNU+Linux distros for 2021. More info in article: Nitrux Zorin OS Pop!_OS Kodachi Rescatux Parrot Security Open Media Vault Porteus Manjaro Puppy Linux Arch Linux Solus NethServer OPNsense Raspberry Pi OS Ubuntu Server DebianEdu/Skolelinux EasyOS https://www.techradar.com/best/best-linux-distros

Popular distros for 2021

Allan_Virtanen

Here's a list with some of the popular GNU+Linux distros for 2021. More info in article:

Nitrux
Zorin OS
Pop!_OS
Kodachi
Rescatux
Parrot Security
Open Media Vault
Porteus
Manjaro
Puppy Linux
Arch Linux
Solus
NethServer
OPNsense
Raspberry Pi OS
Ubuntu Server
DebianEdu/Skolelinux
EasyOS

https://www.techradar.com/best/best-linux-distros

AndrewLowrance

This can't be in popularity order, haven't even heard of many of these and it's all different types of systems in a mix, everything from servers, IoT to desktop. Interesting read tho.

Magnus_Lind

Debian has to be among the more popular choices, and I do believe Cent OS too is pretty big.