txi2p is a set of I2P bindings for Twisted.

txi2p supports both the SAM and BOB APIs for I2P.
The default API is SAM.

Having I2P installed is not required for building.
The I2P source already includes a SlackBuild.

You can get the latest I2P stable release from
https://geti2p.net/en/download#source

or check
https://github.com/i2p/i2p.i2p