Nebula is a peer-to-peer networking tool based on the Noise Protocol Framework. It is not a fully decentralized network, but instead uses central discovery nodes and a certificate authority to facilitate direct, encrypted peer-to-peer connections from behind most firewalls and NAT layers.

BIRD is an Internet routing daemon with full support for all the major routing protocols. It allows redistribution between protocols with a powerful route filtering syntax and an easy-to-use configuration interface.

OpenDHT provides an easy to use distributed in-memory data store. Every node in the network can read and write values to the store. Values are distributed over the network, with redundancy. It includes the following features:

• Lightweight and scalable, designed for large networks and small devices;

• High resilience to network disruption;

• Public key cryptography layer providing optional data signature and encryption (using GnuTLS);

• IPv4 and IPv6 support;

• Clean and powerful C++14 map API;

• Bindings for C, Rust & Python 3;

• REST API with an optional HTTP client and server with push notification support.

The following tools are also included:

dhtnode

A command line tool to run a DHT node and perform operations supported by the library (get, put, etc.) with text values.

dhtchat

A very simple IM client working over the DHT.

mbuffer is a tool for buffering data streams with a large set of features:

• direct support for TCP based network targets (IPv4 and IPv6)

• ability to send to multiple targets in parallel (distribution mode)

• support for multiple volumes

• I/O rate limitation

• high/low watermark based restart criteria

• configurable buffer size

• on the fly MD5 hash calculation

• highly efficient, multi-threaded implementation

This library provides methods for using the stream control transmission protocol (SCTP) in a Go application.

Aircrack-ng is a complete suite of tools to assess WiFi network security. It focuses on different areas of WiFi security: monitoring, attacking, testing, and cracking. All tools are command-line driven, which allows for heavy scripting.

sslh is a network protocol demultiplexer. It acts like a switchboard, accepting connections from clients on one port and forwarding them to different servers based on the contents of the first received data packet. Detection of common protocols like HTTP(S), SSL, SSH, OpenVPN, tinc, and XMPP is already implemented, but any other protocol that matches a regular expression can be added. sslh's name comes from its original application of serving both SSH and HTTPS on port 443, allowing SSH connections from inside corporate firewalls that block port 22.

iPerf is a tool to measure achievable bandwidth on IP networks. It supports tuning of various parameters related to timing, buffers and protocols (TCP, UDP, SCTP with IPv4 and IPv6). For each test it reports the bandwidth, loss, and other parameters.

LibCamera is a complex camera support library for GNU+Linux, Android, and ChromeOS.

pproxy is an asynchronuous proxy server implemented with Python 3 asyncio. Among the supported protocols are HTTP, SOCKS and SSH, and it can use both TCP and UDP as transport mechanisms.

uBridge is a simple program to create user-land bridges between various technologies. Currently, bridging between UDP tunnels, Ethernet and TAP interfaces is supported. Packet capture is also supported.

Proxychains-ng is a preloader which hooks calls to sockets in dynamically linked programs and redirects them through one or more SOCKS or HTTP proxies.

C library implementation of RaptorQ Forward Error Correction for Librecast. RFC6330 (IETF) describes the RaptorQ proposed standard, which LCRQ more-or-less follows. The primary focus has been on building a fast, simple and dependency-free FEC implementation for use with Librecast, and not on strict standards compliance. The code does, however, fairly closely follow the RFC.

parprouted is a daemon for transparent IP (Layer 3) proxy ARP bridging. Unlike standard bridging, proxy ARP bridging can bridge Ethernet networks behind wireless nodes. Normal layer 2 bridging does not work between wireless nodes because wireless does not know about MAC addresses used in the wired Ethernet networks. This daemon can also be useful for making transparent firewalls.

Tool to send a magic packet to wake another host on the network. This must be enabled on the target host, usually in the BIOS.

ENet's purpose is to provide a relatively thin, simple and robust network communication layer on top of UDP. The primary feature it provides is optional reliable, in-order delivery of packets. ENet omits certain higher level networking features such as authentication, server discovery, encryption, or other similar tasks that are particularly application specific so that the library remains flexible, portable, and easily embeddable.

Libnet provides a fairly portable framework for network packet construction and injection. It features portable packet creation interfaces at the IP layer and link layer, as well as a host of supplementary functionality. Using libnet, quick and simple packet assembly applications can be whipped up with little effort.

ipcalc takes an IP address and netmask and calculates the resulting broadcast, network, Cisco wildcard mask, and host range. By giving a second netmask, you can design subnets and supernets. It is also intended to be a teaching tool and presents the subnetting results as easy-to-understand binary values.

Quagga is a routing software suite, providing implementations of OSPFv2, OSPFv3, RIP v1 and v2, RIPng and BGP-4 for Unix platforms.

The Quagga architecture consists of a core daemon, zebra, which acts as an abstraction layer to the underlying Unix kernel and presents the Zserv API over a Unix or TCP stream to Quagga clients. It is these Zserv clients which typically implement a routing protocol and communicate routing updates to the zebra daemon.

Miredo is an implementation (client, relay, server) of the Teredo specification, which provides IPv6 Internet connectivity to IPv6 enabled hosts residing in IPv4-only networks, even when they are behind a NAT device.

The 0MQ lightweight messaging kernel is a library which extends the standard socket interfaces with features traditionally provided by specialized messaging middle-ware products. 0MQ sockets provide an abstraction of asynchronous message queues, multiple messaging patterns, message filtering (subscriptions), seamless access to multiple transport protocols and more.

Wireless networking GUI front-end for iwd, with supported functionality similar to that of iwctl. Features include viewing and connecting to available networks, managing known networks, provisioning new networks via WPS or Wi-Fi Easy Connect, and an indicator icon displaying connection status and signal strength.

The Simple Network Management Protocol (SNMP) is a widely used protocol for monitoring the health and welfare of network equipment (e.g. routers), computer equipment and even devices like UPSs. Net-SNMP is a suite of applications used to implement SNMP v1, SNMP v2c and SNMP v3 using both IPv4 and IPv6.

Nanomsg is a socket library that provides several common communication patterns. It aims to make the networking layer fast, scalable, and easy to use. Implemented in C, it works on a wide range of operating systems with no further dependencies.