Metalsmith - An extremely simple, pluggable static site generator.
RingCentral - RingCentral is the leading provider of cloud-based communications and collaboration solutions for small business and enterprise companies
Nikola - Nikola is s static site generator tool written in Python.
Dialpad - Switch is a cloud-based phone system built for Google Apps users.
GatsbyJS - Blazing-fast static site generator for React
Aircall - Aircall is a call center software of a new generation designed for fast growing companies. Setup instantly and integrates to your CRMs