Wunderlist is a cloud-based to-do list management app.

Twitterrific is a Mac OS X and iOS client for the social networking site Twitter.

Pushline is an app for Android to PC/Mac Notifications' Mirroring and Phone control.

TickTickis a cross-platform to-do list app & task manager helps you to get all things done and make life well organized.

KakaoTalk (Korean: 카카오톡), or sometimes KaTalk, is a free mobile instant messaging application for smartphones with free text and free call features.

ScaleDrone is a real-time messaging service and platform.