Symbian instant messaging clients

former instant messaging service

instant messaging software service

instant messenging protocol

Gadu-Gadu (Polish for "chit-chat"; commonly known as GG or gg) is a Polish instant messaging client using a proprietary protocol. At its peak, Gadu-Gadu was the most popular IM service in Poland, with over 15 million registered accounts and up to 300 million messages sent per day. In 2010, the service reported over 10 million monthly active users.

third-party closed-source freeware multiprotocol IM client

computer program

eBuddy is a privately held Dutch software company that offers instant messaging services. As of 2011, eBuddy reported 100 million downloads. The company's flagship service is XMS, a proprietary cross-platform instant messaging service. After some changes of ownership, the company is now again owned by its original founders, Onno Bakker and Jan-Joost Rueb.