If you're using Gmail as your primary email client, Google Contacts is probably your go-to choice for storing contacts. Bombshell: Google Contacts is far from the perfect contact management tool.

Being integrated with Google Contacts and G Suite apps, NetHunt CRM is a powered-up address book that helps users to engage their contacts through multiple sales and marketing processes out of Gmail itself.
Link emails, chats, events, deals, and opportunities automatically to contacts; filter your contacts, fire out email campaigns… and so much more. Check this video and see how you can sync your Google Contacts into NetHunt CRM in just a few clicks.