Meebo has been discontinued. Similar apps include Pidgin, which is free and open source. Other options are RetroShare, Adium, Trillian and Messenger. There's no shortage of Instant Messengers like Meebo, with more than 25 alternatives for Mac, Windows, Linux, Android and iPhone.
QQ is a widely used Chinese instant messaging service developed by Tencent, offering chat, voice, and video communication. It integrates social networking features like groups, forums, and customizable avatars to enhance user interaction.
China
Brosix is a secure communication tool for businesses that need a functional way to organize their internal communication.
United States
Slick is a messenger application for mobile devices. It allows you to chat with your friends connected though various online messaging applications. Currently it is still in development, an alpha version
Slovakia
EU
qutIM - free open-source multiprotocol ( ICQ, Jabber/GTalk/Ya.Online/LiveJournal.com, Mail.Ru, IRC )
Russia
Pinger lets you text and talk free with the people you care about most, anywhere on the planet. Tap a picture and you'll see all of your communications—texts, pics, calls, voicemails—all in one place.
United States
Finch is a console-based IM program that lets you sign on to AIM, Jabber, MSN, IRC, Yahoo!, and other IM networks. It runs on Unixes. It uses GLib and ncurses.
Sim-IM, Simple Instant Messenger, is a multiple protocol instant messenger for MS Windows, GNU/Linux, FreeBSD. Sim-IM supports Jabber/XMPP, Google Talk, ICQ and AIM (Oscar), Yahoo! Messenger and Microsoft Messenger (MSN)
aMSN is a free open source MSN Messenger clone. aMSN attempts to emulate the look and feel of Windows Live Messenger, and supports many of its features.
Offline Messaging Voice Clips Display pictures Custom emoticons Multi-.
Argentina
Coccinella is a free and open-source cross-platform instant messaging client with a built-in whiteboard for improved collaboration with other people.
Line2 is a VoIP phone service that lets you call & text from a separate phone number via WiFi or 3G/4G/LTE. At a small premium, Text & call ANYONE in the US/Canada, forwarding & more. Pick any phone number.
United States
AQQ is a Polish (but available in English) multiprotocol instant messenger with support of: AQQ, Jabber, Gadu-Gadu, Tlen and ICQ. It has many great features like: one tabbed message window for all conversations; quick search for contacts; file sending (even through FTP thanks to...
PolandEU
Kadu is an open source Jabber/XMPP and Gadu-Gadu instant messenger client for Linux, *BSD, Mac and Windows.
Russia
