FileProInfo - It's All About Files, Software, Online Tools - 100% Free
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!
File-Extensions.org - Large computer file extension library with detailed explanation of each file type with links to download free or associated software programs.
VOGSY - Professional service automation tool built on Google G Suite
GroupDocs - GroupDocs is a web-based service for online document sharing, collaboration and management.
Office Timesheets - Professional Services Automation