This is an alphabetic list of defunct instant messaging platforms.
| Brand | Developer(s) | Country | Launched | Discontinued |
|---|---|---|---|---|
| AIM | AOL | United States | 1997 | 2017 |
| aMSN | Microsoft | United States | 2002 | 2012 |
| BBM | BlackBerry Ltd. | Canada | 2005 | 2019 |
| BBMe for Personal Use | BlackBerry Ltd. | Canada | 2019 | 2024 |
| Beeper Mini | Automattic | United States | 2023 | 2024 |
| ChatON | Samsung Electronics | South Korea | 2011 | 2015 |
| Empathy | Guillaume Desmottes, Xavier Claessens | 2007 | 2017 | |
| Fetion | China Mobile | China | 2007 | 2022 |
| FireChat | Open Garden | United States | 2014 | 2018 |
| Gizmo5 | United States | 2005 | 2011 | |
| Google Allo | United States | 2016 | 2019 | |
| Google Hangouts | United States | 2013 | 2022 | |
| Hike Messenger | Hike Private Ltd. | India | 2012 | 2021 |
| HipChat | Atlassian | Australia | 2009 | 2017 |
| iChat | Apple | United States | 2002 | 2012 |
| ICQ | VK | Russia | 1996 | 2024 |
| Instantbird | Florian Quèze | United States | 2007 | 2013 |
| Meebo | United States | 2005 | 2012 | |
| MessageMe | Yahoo! | United States | 2012 | 2014 |
| Microsoft Kaizala | Microsoft | United States | 2017 | 2023 |
| Microsoft Lync | Microsoft | United States | 2010 | 2015 |
| Microsoft Messenger service | Microsoft | United States | 1999 | 2014 |
| Microsoft Office Communicator | Microsoft | United States | 2007 | 2010 |
| MSN Messenger | Microsoft | United States | 1999 | 2005 |
| Mxit | Mxit Ltd. | South Africa | 2005 | 2016 |
| MySpaceIM | Myspace | United States | 2006 | 2009 |
| Odigo Messenger | Comverse Technology | Israel | 1999 | 2004 |
| ooVoo | Krush Technologies, LLC | United States | 2007 | 2017 |
| PowWow | Tribal Voice | United States | 1994 | 2001 |
| QIP | RBK Group | Russia | 2005 | 2012 |
| Skype | Microsoft | United States | 2003 | 2025 |
| Skype for Business | Microsoft | United States | 2015 | 2021 |
| Skype Qik | Microsoft | United States | 2014 | 2016 |
| Stride | Atlassian | Australia | 2017 | 2019 |
| Surespot | Surespot LLC | United States | 2012 | 2022 |
| Upptalk | Spain | 2010 | 2017 | |
| Windows Live Messenger | Microsoft | United States | 2005 | 2012 |
| Windows Messenger | Microsoft | United States | 2001 | 2008 |
| Windows Messenger service | Microsoft | United States | ||
| Xfire | Xfire, Inc. | United States | 2003 | 2015 |
| Yahoo! Livetext | Yahoo! | United States | 2015 | 2016 |
| Yahoo! Messenger | Yahoo! | United States | 1998 | 2018 |