Monero

Tari   (Compare Project)

Mostly written in Rust

License: BSD-3-Clause

I2P   (Compare Project)

Mostly written in Java

License: bsd, mit, Public_Domain

i2pd   (Compare Project)

Mostly written in C++

License: BSD-3-Clause

Flowee.org   (Compare Project)

License: Unknown

bisq   (Compare Project)

Mostly written in Java

License: AGPL3

The Freenet Project   (Compare Project)

Mostly written in Java

License: gpl

GNUnet   (Compare Project)

Mostly written in C

License: gpl3_or_later

Decentralized-Internet   (Compare Project)

Mostly written in JavaScript

License: lgpl, zlib_libpng

Whonix   (Compare Project)

License: gpl3_or_later

Gridcoin   (Compare Project)

Mostly written in C

License: mit