Efficcess is described as 'A full-featured personal information manager that can help you manage your life. Use it to keep track of contacts, tasks, appointments, to-do lists, birthdays, and more'. There are more than 100 alternatives to Efficcess for a variety of platforms, including Windows, Mac, Linux, Online / Web-based and Android. The best alternative is Thunderbird, which is both free and Open Source. Other great apps like Efficcess are K-9 Mail (Free, Open Source), Microsoft Office Outlook (Paid), Mailspring (Freemium, Open Source) and Evolution (Free, Open Source).
HCL Notes (formerly IBM/Lotus Notes) is the email client software that gives teams access to email, calendar and contact management capabilities, and seamlessly integrates other collaboration tools and Domino business applications.
WinMilk is a Windows Phone client for the to-do list service 'Remember the Milk'. WinMilk lets you view your RTM tasks by date, list, smart list and tag, as well as search. WinMilk also lets you add new tasks with RTM’s Smart Add syntax and complete and postpone tasks.
CalendarWiz offers everything organizations need in one calendar. Do it all in one application with our shared calendar features, website plugins, room & facility scheduling, and mobile app. Ideal for education, churches, business, government, non-profits and clubs.
Keep track of all your Events with free SMS and Email notifications. Store and organize your Events and To-do on Ominder and never forget them again. Events include weather forecast for better planning. All Events and To-do include countdown and age timers for better management.