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

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

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.

Join allows you to easily do stuff remotely on your Android and PC devices like SMS, notifications, clipboard, and much more.

ScaleDrone is a real-time messaging service and platform.

Echofon is the easy-to-use, super fast Twitter app that smartly syncs across all your devices.

SendPulse is an integrated service to manage email, text and webpush campaigns.

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

SashiDo.io is a Parse server alternative hosting for busy people.

Boxcar is a universal push notification platform.

App.net was an ad-free online social networking service and microblogging service.