Many people have their different email networks like Yahoo, Gmail, AOL, Facebook and many more so can you with just one IM clients installed on your pc talk and chatting with your friends on other different mail networks without needs to install all IM apps. The solution is available to solve this problem, it’s called multi-protocol clients.There are some great multi/Dual /Single protocol instant messaging apps out on Windows, MAC, Linux or Smartphones So which one is the best to use?

Skype



Skype is Single-protocol software operated by Microsoft that allows the world's conversations. Millions of individuals and businesses use Skype to make free internet video and voice calls, send instant messages and share files with other people on Skype. With Skype you can make internet calls for free. Skype is free to download and easy to use.



Skype Available on (Windows,MAC, Windows Phone, iPhone, Android)
Download Skype 6.3 Offline Installer Now latest Version




Pidgin





Pidgin is multilingual free (open source) multi-protocol IM used by millions of users around the world and easy to use. Pidgin allows you connect to AIM, MSN, Yahoo, and more chat clients all at once. Also you can be chatting with friends on other chat networks.Pidgin is compatible with the following chat Programs: AIM, Bonjour, Gadu-Gadu, Google Talk, Groupwise, ICQ, IRC, MSN Messenger, MXit, MySpaceIM, SILC, SIMPLE, Sametime, XMPP, Yahoo!, and Zephyr.



Pidgin Available on (Windows, Linux, and other UNIX OS)

Download Pidgin offline installer - latest version




AIM


AIM is multi-protocol IM the easy way to start chatting and sharing with people and groups you care about on the internet. Now you can make video chat, full control message history and syncing with AIM you can Share your favorite videos, pictures, tweets and more. AIM allows you connect and chat with your friends on AIM, Facebook, Google Talk, Instagram and Google+ all at once and mobile text messaging AIM supports sending SMS to US mobile numbers only.



AIM Available on (Windows, MAC, IPAD, IPHONE, Android OS)
Download AIM latest version




Yahoo! Messenger




Yahoo! Messenger Allows you to instant message with your friends on the Yahoo, LCS, Lotus sametime, Microsoft Live Networks Send text messages in real-time to your friends on Yahoo! Messenger. Show your style with emoticons, Avatars, IMVironments and Photo Sharing.Now you can chat with your Facebook friends directly from your Messenger.



Yahoo! Messenger Available on (Windows, MAC, IPHONE, WEB)  Type: Dual-protocol
Download Yahoo! Messenger Offline installer Latest Version 




Nimbuzz




Nimbuzz is the best free multi-protocol IM, mobile messenger & phone app for your Windows PC, Mac or mobile phone. It’s cheap VOIP, phone calls. Nimbuzz is everything you need to communicate and stay Connected. Call, chat and messaging for free. Share photos, music and videos.

it’s Supports Yahoo! Messenger, Windows Live Messenger (MSN), ICQ, AIM, Facebook, MySpace, Gadu-Gadu, Google Talk, Hyves and more.

Nimbuzz is available on most popular devices across all major platforms – Nokia Symbian, iPhone, iPod touch, Android, BlackBerry, J2ME, also Windows and Mac desktop computers.

Download Nimbuzz Offline installer Latest Version