FosstardCalling

Signal

Whatsapp cloan

Pros

• open source
• easy to use
• cross platform

Cons

• somewhat centralized
• depends on smart phone ownership

XMPP

ICQ/AOL cloan

Pros

• lightweight
• decentralized
• easy to use

Cons

• can't voice/video call on windows
• no group calls

Jami

Pros

• P2P
• E2EE
• GNU/FSF endorsement
• cross-platform

Cons

• can be slow
• janky
• no one uses it

Mumble

Teamspeak cloan Pros

• Lightweight
• Crossplatform
• Good for group calls

Cons

• No encryption
• No video calls
• Not great for 1on1 (?)

Jitsi

Zoom cloan

Pros

• Cross platform
• Voice/video group calls
• Supports E2EE

Cons

• Not good for 1on1

Matrix

Discord cloan

Pros

• Good multiuser chats
• Decentralized
• End to end encryption
• Supports calls

Cons

• Most users use central server
• Metadata logging
• Server is a cunt
• Most clients are ass

Tox

Pros

• P2P
• Has calling (?)
• Made by 4chan (?)

Cons

• Leaks IP

Gikopoi

Pros

• Anonymous
• Fun
• Easy to use
• Right here

Cons

• Requires JavaScript
• Needs WebRTC
• Nontrivial to stream on windows
• Goes through Google's STUN server
• No 3rd-party client support as of yet