Apps to Support for Multiple protocols

MLDonkey is a discontinued open-source, multi-protocol file-sharing application acting as a back-end server. It supported various peer-to-peer networks like eD2k, Kad, and BitTorrent, offering a flexible solution for downloading and sharing files across different platforms.

Kiwi IRC is a modern, open-source web-based Internet Relay Chat (IRC) client designed for simplicity and ease of use. It allows users to connect to various IRC networks directly through their web browser without needing to install desktop software.

Konversation is a feature-rich Internet Relay Chat (IRC) client designed for the KDE Desktop Environment. It provides a user-friendly interface for connecting to IRC networks, participating in channels, and communicating with other users around the globe.

Shareaza is a veteran peer-to-peer file sharing client for Windows, distinguished by its support for multiple network protocols including Gnutella2 (G2), eDonkey, and BitTorrent. It offers a robust feature set for searching, downloading, and managing files across various networks, providing a versatile platform for digital content acquisition.

WeeChat is a highly customizable, free and open-source command-line based chat client. Designed for efficiency and portability, it supports multiple protocols including IRC and XMPP, making it a versatile tool for connecting to various networks.

qutIM is a free and open-source, multi-protocol instant messenger designed for connecting to various networks including ICQ, Jabber, Mail.Ru, IRC, and VKontakte. It offers a unified interface for managing multiple accounts and conversations.

OpenMediaVault (OMV) is a free, open-source Network Attached Storage (NAS) solution based on Debian Linux. It provides a web-based interface for easy management of file storage, sharing, and backup services within a home or small business network.

Miranda NG is a highly extensible, multi-protocol instant messaging client for Windows. A successor to the popular Miranda IM, it offers a modular architecture supporting numerous chat networks, allowing users to consolidate their conversations into a single interface. It's designed for resource efficiency and deep customization.

Gajim is a free and open-source instant messaging client for the XMPP protocol. Built using the GTK+ toolkit, it offers a wide array of features for secure and flexible communication, including encrypted chat, group conversations, multi-protocol support via gateways, and extensive customization options.

SoftEther VPN is a free and open-source, cross-platform, multi-protocol VPN software solution. It functions as both a VPN client and server, offering high compatibility and advanced features for building secure and flexible VPN connections.

aMule is a free and open-source peer-to-peer file sharing application designed for flexibility and decentralization. Supporting the robust eDonkey and Kad networks, it offers a secure and privacy-focused approach to finding and sharing digital content across multiple platforms.

Kopete is a versatile, free and open-source instant messaging client designed initially for the KDE Plasma desktop. It distinguishes itself by supporting a multitude of protocols, allowing users to connect to various chat networks from a single application.

uGet is a powerful and lightweight open-source download manager for Windows and Linux. It accelerates downloads, supports multiple protocols like HTTP, FTP, BitTorrent and Metalink, and features resume capabilities, browser integration, and robust clipboard monitoring.

XChat for Linux is a venerable IRC chat client designed for connecting to IRC networks and participating in chat rooms (channels). It offers support for multiple simultaneous connections, public and private conversations, and a high degree of customization through plugins.

FrostWire is a powerful, free, and open-source BitTorrent client with integrated search, media player, and support for various file-sharing protocols. It simplifies downloading and sharing large files, including music, videos, and software, while offering features like YouTube and Soundcloud downloading.

HexChat is a free and open-source Internet Relay Chat (IRC) client. Built upon the foundations of XChat, it offers a robust platform for connecting to various IRC networks and participating in real-time text-based conversations, making it a favored choice for users seeking a reliable and customizable chat experience.

Empathy is a versatile multi-protocol messaging client designed for text, voice, and video communication across numerous IM networks. It offers features like file transfers, location sharing, and integration with various services, providing a unified communication experience.

Miranda IM is a lightweight, open-source, multi-protocol instant messaging client designed specifically for Microsoft Windows. Known for its extensibility and resource efficiency, it allows users to connect to various chat networks simultaneously through a flexible plugin-based architecture.

OpenSSH is the leading open-source implementation of the Secure Shell (SSH) protocol, providing a secure and reliable method for remote access, file transfer, and network tunneling. It encrypts all communications, protecting against eavesdropping and connection hijacking.

KVIrc is a versatile and highly customizable graphical IRC client available for Linux, Unix, macOS, and Windows. It is designed to cater to both seasoned IRC users seeking advanced control and newcomers looking for a user-friendly interface to connect to various IRC networks.