Desktop Notifications - Light and fast applications for notifications mirroring between devices.
AirDroid - Access Android phone/tablet from computer remotely and securely. Manage SMS, files, photos and videos, WhatsApp, Line, WeChat and more on computer.
AirMore - AirMore is a cross-platform toolset that can help you manage any Android device wirelessly.
KTimer - KTimer is a little tool to execute programs after some time.
Pushbullet - Pushbullet - Your devices working better together
KDE Connect - Integrate Android with the KDE Desktop