Deputy - Deputy is a software for employee scheduling, time and attendance and communication management.
Google Voice - Google Voice gives you one number for all your phones, voicemail organized in an email format, free...
When I Work - When I Work is an employee scheduling and communication app using the web, mobile apps, text messaging, social media, and email.
TextMe - TextMe is a free calls and messaging application at both local and international levels.
Planday - Employee scheduling, time tracking & absence management
Talkatone - Android App on. Google Play. Stop paying for cell minutes, texts & landlines; Turn your iPad or iPod touch into a phone; Call/Text even in areas with bad cell coverage; Call/Text when travelling without paying for expensive international minutes.