Telegram - Telegram is a messaging app with a focus on speed and security. It’s superfast, simple and free.
RingCentral - RingCentral is the leading provider of cloud-based communications and collaboration solutions for small business and enterprise companies
Gitter - Where developers come to talk.
Dialpad - Switch is a cloud-based phone system built for Google Apps users.
Flock - A faster way for your team to communicate
Nexys Mobile - Mobile Phone plans and Services for highly mobile small business workers and entrepreneurs who run their lives from their phone.