What are some alternatives?
When comparing Join by joaoapps and Join, you can also consider the following products
AirDroid - Access Android phone/tablet from computer remotely and securely. Manage SMS, files, photos and videos, WhatsApp, Line, WeChat and more on computer.
Pushbullet - Pushbullet - Your devices working better together
Pushover - Real-time notifications on your Android, iPhone, iPad, and Desktop
Mobizen - Use your Android from a web browser or desktop.
AirMore - AirMore is a cross-platform toolset that can help you manage any Android device wirelessly.
KDE Connect - Integrate Android with the KDE Desktop