Stars indicate closer matches.


OSIP 

Tox (protocol) 

Wengo 

Jitsi 

AIM (software) 

Skype 

Yahoo! Messenger 

Jami (software) 

Guilded 

TNT (instant messenger) 

Discord 

Gizmo5 

QuteCom 

OoVoo 

SightSpeed 

Google Talk 

Line (software) 

WhatsApp 
Ayttm 
BitlBee 
Climm 
Psi (instant messaging client) 
Tkabber 
WASTE 
Coccinella (software) 
KDE Telepathy 
AMSN 
VSide 
TokBox 
Wire (software) 
Trillian (software) 
Ekiga 
Windows Live Messenger 
Viber 
ChatON 
KakaoTalk 
WeChat 
BiP (software) 
Comparison of user features of messaging platforms 
IGap 
Telegram (software) 
Nimbuzz 
Bicom Systems 
Google Meet
Instantbird
Meetro
Messages (Apple)
Mumble (software)
Yate (telephony engine)
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