Below is an alphabetic list of defunct instant messaging platforms, showing name, when discontinued and type of client'
- AOL Instant Messenger, 2017
- BBM, 2019
- ChatON, 2015
- Emesene, 2013 – MSNP (Microsoft Notification Protocol or Mobile Status Notification Protocol)
- FireChat
- Gizmo5, 2011 – Multi protocol
- GMX Multi Messenger
- Google Allo, 2019
- Google Hangouts, 2021
- IChat, 2012
- Meebo, 2012
- Microsoft Messenger service, 2014
- OoVoo, 2017
- PowWow, 2001
- Skype Qik
- Talk City, 2002
- Upptalk
- Xfire, 2015
- Yahoo! Messenger, 2018
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