TAG is described as 'Use your time efficiently by speaking to people when it is convenient for both of you, without scheduling a meeting. TAG allows you to make and receive calls only when you actually have the time to do so' and is a appointment scheduler in the office & productivity category. There are more than 50 alternatives to TAG for a variety of platforms, including Web-based, SaaS, Android, iPhone and Android Tablet apps. The best TAG alternative is Fossify Calendar, which is both free and Open Source. Other great apps like TAG are Thunderbird Appointment, Notion Calendar, Cal.com and Right Calendar.