Zoho Invoice - 100% free online invoicing software for small businesses.
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!
FreshBooks - The ideal accounting software for small business owners.
VOGSY - Professional service automation tool built on Google G Suite
Invoice Ninja - Invoice Ninja is a free, open-source solution for invoicing and billing customers.
Office Timesheets - Professional Services Automation