Bitcoin, if done right.
Monero. It's private by default.
Tor
VPN
SimpleX
QubesOS
GrapheneOS
Self Hosting
VeraCrypt
GPG
PGP
Double Ratchet Encryption
Home network open source firewall
RAM only servers
In person communications
Independent Radio
Ham Radio
Open source software and hardware
The printed word
...I could go on and on, but I'll stop here :)
