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!
NeverBounce - Real-time email verification and cleaning to ensure emails never bounce.
VOGSY - Professional service automation tool built on Google G Suite
Email Verifier - Email verifier app lets you verify email.
Office Timesheets - Professional Services Automation
Verimail - Clean up email-address lists of any size or use our powerful API for real-time verification.