近期研究了下开源的IM软件：
| 软件名 | 源码语言 | 开源协议 | 网站地址 |
| PIDGIN | c,gcc/MinGW,gtk+ | GPL v2 | http://www.pidgin.im/ |
| Instantbird | c+MozillaBuild | MPL1.1 | https://wiki.instantbird.org/Main_Page |
| RetroShare | c,cpp,QT | MPL1.1 | http://retroshare.sourceforge.net/downloads.html |
| OneTeam | JS, C++ XPCOM, Mozilla/XUL | MPL1.1 | https://github.com/processone/oneteam |
| Coccinella | TCL | GPLv3 | http://coccinella.im/ |
| OpenFire+Spark | java | GPLv2 | http://www.igniterealtime.org/downloads/index.jsp |
| iQQ | java | LGPL | https://github.com/im-qq |
| ipmsg（飞鸽传书） | vc | no control | http://ipmsg.org/ |
| ipmsg .Net | C# | GPLv3 | http://code.google.com/p/ipmessagernet/ |
| freeeim（飞秋） | vc | no control | http://freeeim.com/ |