I would guess Tor, I2P, Freenet, GNUNet. But also configuring or avoiding certain other software: https://spyware.neocities.org/articles/index.html https://spy

I would guess Tor, I2P, Freenet, GNUNet. But also configuring or avoiding certain other software: https://spyware.neocities.org/articles/index.html https://spyware.neocities.org/articles/index.html