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inetutils
iputils including ping and tracepath (and traceroute)
iproute2 (and netstat)
tcpdump and pcap files
nmap suite including ncat (and netcat/nc)
BIND (including dig, nslookup and host)
whois
/etc/hosts and dnsmasq
git
email
rsync
Secure SHell (ssh)
Network File System (NFS)
iptables and ufw (uncomplicated firewall)
WireGuard and OpenVPN
Merkel trees
internet message access protocol (imap)
post office protocol (pop)
simple mail transfer protocol (smtp)
domain name system blocklist (dnsbl)