- WhatsApp

- Facebook Messenger

- Telegram

- Signal

- iMessage

- Session

- Discord

- Messages by Google

- Google Chat

- Viber

- WeChat

- Skype

- VK Messenger

- Yandex Messenger

- Line

- Snapchat

- Twitter Chat

- Instagram Chat

- Verizon Messages

- Microsoft Teams

- Threema

- Element (matrix)

What else?