1    Mobile Phone Interface
    <https://en.wikipedia.org/wiki/TrueMove_H>

    <https://en.wikipedia.org/wiki/Advanced_Info_Service>

2    E-Mail Client
    <https://en.wikipedia.org/wiki/Mozilla_Thunderbird>

3    LinkedIn Messaging
    <https://en.wikipedia.org/wiki/LinkedIn>

4    Facebook Messenger
    <https://en.wikipedia.org/wiki/Facebook>

----------------------------------------------

5    Google Meet (browser-based))
    <https://en.wikipedia.org/wiki/Google_Meet>

6    Zoom Video Communications
    <https://en.wikipedia.org/wiki/Zoom_(software)>

7    Teams (Microsoft)
    <https://en.wikipedia.org/wiki/Microsoft_Teams>

8    Skype (Microsoft))
    <https://en.wikipedia.org/wiki/Skype>

----------------------------------------------

9    WhatsApp
    <https://en.wikipedia.org/wiki/WhatsApp>

10    LINE
    <https://en.wikipedia.org/wiki/Line_(software)>

11    Signal
    <https://en.wikipedia.org/wiki/Signal_(software)>

12    Viber
    <https://en.wikipedia.org/wiki/Viber>

NOTE:

1 -  4:   common standard tools

6 -  8:   stand-alone versions for Windows available

9 - 12:  Android-based apps with optional Windows clients (smartphone required)