The best alternatives to Quickness are Google Pixel, Streak, and Twitter Bots. 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.
Create Twitter bots that can auto-reply, retweet tweets, send DMs, follow users, add users to Twitter list, and more all without writing a single line of code.
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.
Contacts+ is a cloud-based address book designed to take the hassle out of contact management so you can focus on what matters most - relationships. Truly multi-platform, Contacts+syncs your contacts across your devices (including iOS, Mac, PC, & other mobile devices) as well as across various accounts you may store contacts in (such as Gmail, Exchange, Office365, and Twitter).