1. Free and secure calls and messages to anyone, anywhere. Keep your conversations going no matter where you are.

  2. Telegram is a messaging app with a focus on speed and security. It’s superfast, simple and free.

  3. Hangouts bring conversations to life with photos, emoji, and even group video calls for free. Connect with friends across computers, Android, and Apple devices.

  4. Jive's Hosted VoIP UC platform is an enterprise-grade business phone system that works for any organization. Welcome to Unified Communications in the cloud.

  5. A secure, end-to-end encrypted Swiss instant messenger with a focus on privacy.

  6. Fast, simple & secure messaging. Privacy that fits in your pocket.

  7. WhatsApp Messenger: More than 1 billion people in over 180 countries use WhatsApp to stay in touch with friends and family, anytime and anywhere.

  8. Switch is a cloud-based phone system built for Google Apps users.

  9. Use your iPhone, iPad or iPod touch to make and receive calls using your 8x8 Virtual Office phone...

  10. Grasshopper enables entrepreneurs to build a virtual office that connects callers to employees, wherever they are.