Cisco WebEx is a cloud-based communication & collaboration app which combines screen sharing with voice & video conferencing, call recording, mobile apps & more.
Lifesize is an audio, web & video conferencing tool which supports chat functionality, an integrated search-based directory, plus video call recording & sharing.
Microsoft Outlook is an personal information manager from microsoft which helps users communicate, manage schedules & find what they need quickly & easily.
Skype is a multi-channel communications software that provides video chat, voice calls, instant messaging & more to business of all sizes, across the world.
Skype for Business Server is a unified communications platform that integrates common channels of business communications and online meetings on resident operating systems.
Microsoft Teams is a chat-based workspace in Office 365 which lets users collaborate on documents, make voice & video conference calls, view chat logs, and more.