Boomerang.io alternatives

WhatsApp Messenger is a FREE messaging app available for iPhone, Android, and other smartphones. WhatsApp uses your phone's Internet connection (4G/3G/2G/EDGE or Wi-Fi, as available) to let you message and call friends and family. Switch from SMS to WhatsApp to send and receive messages, calls, photos, videos, documents, and Voice Messages.

Reminder app is a way for anyone to receive notifications of important tasks or deadlines. Reminders can be set in a matter of seconds, providing an ultra-simplified tool. Reminder distinguishes itself from its peers by cutting out over-complicated features.