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Re:Invisible Internet Project (I2P) by osgovernment on Monday January 11, 2021 @10:51PM (#25742048)
There is a C++ implementation that is pretty nice:

https://github.com/PurpleI2P/i2pd

Re:Invisible Internet Project (I2P) by benji_is_me on Tuesday January 12, 2021 @12:01AM (#25742513)
There was also Kovri (a fork of i2pd made by the Monero project) that sadly appears to be dead now.[1] It could have greatly increased the number of nodes on I2P.

[1]: https://gitlab.com/kovri-project/kovri