Should/Must have:

OS Desktop:
Gentoo
Fedora

OS Server:
Debian
Alma/Rocky
RedHat
Ubuntu

Server Apps:
FreeIPA
Postfix/Dovecot (opendkim,opendmarc,spamassassin)
amavisd-new
Apache
Bind9
certbot
fetchmail
mariadb
rkhunter
roundcube
webmin
usermin
wireguard
zabbix

General:
bash-completion
mc

Backup:
Veeam

Seurity:
chkrootkit
rkhunter
clamav
fail2ban
gpg
nmap
openscap
sshguard

Browsers:
Chromium
Firefox
Brave
Chrome

Virtualization:
kvm
qemu