Pushover - Real-time notifications on your Android, iPhone, iPad, and Desktop
Mightytext - Send & Receive SMS Text Messages from your computer. Sync'd with your Android #
Pushbullet - Pushbullet - Your devices working better together
AirDroid - Access Android phone/tablet from computer remotely and securely. Manage SMS, files, photos and videos, WhatsApp, Line, WeChat and more on computer.
Gotify - a simple self-hosted server for sending and receiving messages
DeskSMS - DeskSMS forwards your text messages to your GMail, Google Chat, and DeskSMS Chrome and Firefox...