Trillian - Trillian is a decentralized and federated instant messaging platform that lets your whole company send private and group messages, keep tabs on what co-workers are doing, share files, and much more.
OneLogin - On-demand SSO, directory integration, user provisioning and more
Telegram - Telegram is a messaging app with a focus on speed and security. It’s superfast, simple and free.
TeamPassword - TeamPassword helps you manage and share access to the apps, services, and tools your team needs to keep projects moving.
Skype - Stay in touch with your family and friends for free on Skype. Download Skype today to chat and call on desktop and mobile.
Teramind - Teramind provides a user-centric security approach for monitoring.