Pandion NG is an open source instant messenger. Designed to be secure, easy and fun to use. Pandion is also compliant with the open standard XMPP (aka Jabber).
Based on Pandion.
Miranda NG is a successor of a popular multi-protocol instant messaging client for Windows - Miranda IM. Very light on system resources and extremely fast.
climm is a very portable text-mode instant messenger – it is known to compile under Linux, BSD, AIX, HPUX, Windows, AmigaOS and with restrictions BeOS.
climm was named mICQ in the past and started as ICQ-clone. It's intended to be a multi-messenger which supports other networks like Jabber/XMPP as well.
RetroShare is a cross-platform private P2P sharing program. It lets you share securely your friends, using a web-of-trust to authenticate peers and OpenSSL to encrypt all communication. RetroShare provides filesharing, chat, messages and channels.
Fully featured free open source messaging platform for iPhone and iPad. The project is written in Objective C but fully supports Swift projects. Turn your app into a community by allowing your users to send messages. Or you can use the stand alone demo project to quickly deploy a fully functionality instant messaging app.
WinPopup Protocol is a protocol plugin for Miranda IM. It allows to send and receive messages from computer to computer without using dedicated servers over Microsoft Network ( SMB ). Its MS WinPopup, net send, VikPoup, RealPopup, Netter etc. compatible.
IMPULS (Instant Messenger Personal User Log Storage) is a toolset which allows to retrieve, store and display messages from different IM instances in a central database.
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