Blink - Blink is a team and employee app, with a Feed, Chat and Hub (for documents, links, files).
Kissflow - Kissflow is a workflow tool & business process workflow management software to automate your workflow process. Rated #1 cloud workflow software in Google Apps Marketplace.
Basecamp - A simple and elegant project management system.
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!
LumApps - The intranet enterprise portal recommended for GSuite 👥
Zenphi - Google Workspace automation, simplified.