List of free network-protocol stuff for developerππ½
If you're looking for all programming tools around network-protocol (not just free). Check this page List of network-protocol Programming Tools

Dat Protocol Foundation
A distributed ledger & peer-to-peer data sharing toolkit.
Tag: network-protocol
remoteStorage
Open protocol for per-user storage on the Web
Tag: network-protocol, communication, storage
Free self-hosted

BitTorrent
BTFS is the first scalable, decentralized file storage system, revolutionizing file storage while improving security and combating censorship.
Tag: network-protocol, storage
Activity Pub
ActivityPub is a decentralized social networking protocol based on the ActivityStreams 2.0 data format. ActivityPub is an official W3C recommended standard published by the W3C Social Web Working Group.
Tag: network-protocol
Solid Project
Solid: Your data, your choice. Advancing Web standards to empower people.
Tag: network-protocol
Hypercore Protocol
Hypercore Protocol is a peer-to-peer data network built on the Hypercore logs. Hypercores are signed, append-only logs
Tag: network-protocol
