Installed and am configuring #i2p.
I2P is short for the Invisible Internet Project, spawned in 2003, and is an anonymizing network that focuses on secure internal connections between users.
The Tin Hat site has a detailed i2p tutorial https://thetinhat.com/tutorials/darknets/i2p.html
And what good is an anonymizing network without a list of safety tips: https://medium.com/@The_Tin_Hat/i2p-safety-opsec-tips-to-stay-anonymous-8bf622531c40