The best alternatives to Eyecon are Streak, Google Contacts, and Contact Faces. If these 3 options don't work for you, we've listed a few more alternatives below.
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CRM in your Inbox. Streak helps you with business processes inside Gmail.
Streak was announced as Google's 2018 Technology Partner of the Year, in recognition of our fully integrated CRM and deep, powerful integration with all of G Suite - Gmail, Calendar, Drive and Sheets.
Google Contacts is Google's contact management tool that is available in its free email service Gmail, as a standalone service, and as a part of Google's business-oriented suite of web apps Google Apps.
Sparkbook is a smart phonebook that sparks rich personal or business relationships. The app gives you a social check-up, focusing you on a few people at a time that you're losing touch with. Shuffle your favorites, send pre-written messages, and take notes.