Slack - A messaging app for teams who see through the Earth!
Bitrix24 - Bitrix24 is a free (for small businesses) social enterprise platform. It is a united work space which handles the many aspects of daily operations and tasks. Create your own social intranet in minutes!
Mattermost - Mattermost is an open source alternative to Slack.
VOGSY - Professional service automation tool built on Google G Suite
Telegram - Telegram is a messaging app with a focus on speed and security. It’s superfast, simple and free.
Office Timesheets - Professional Services Automation