Calvetica!

Microsoft Outlook, part of the Microsoft Office Suite (not to be confused with Microsoft Outlook Express), is a personal information manager that lets you manage your e-mail, calendar, contacts, and tasks.

Keep track of your busy schedule and share it with others using Calendar. Create separate calendars — one for home, another for school, a third for work, and so on. See all your calendars in a single window or choose to see only the calendars you want. Calendar lets you create invitations using information from Contacts, update your guest list, keep track of responses, and receive the latest status information. When you or another Mac user receives a Calendar invitation via Mail, it’s automatically added. Calendar also works with iCloud, Yahoo!, and Google. And when you use iCloud, every Calendar edit you make on your Mac automatically appears on your iPad, iPhone, and iPod touch. So no dinner dates are missed, no meeting goes unattended, and no anniversary is forgotten. »

An offline calendar without any other calendar integration. You can easily create recurring events and setup reminders, it can also display week numbers.

Dials' unique clock-based view of your day is easier and faster to view than the standard “list view” format other mobile calendars use. Dials' “one hand, one thumb” entry and edit of events also makes Dials the easiest and best on-the-go way to manage your schedule.

CalenGoo gives you a fast and easy way to access and change your Google Calendar (or Google Apps Calendar) with your Android device. It can either work with the built-in calendar or it can sync directly with Google.

Share Calendars on a LAN and sync with Google Calendar.

BEAUTIFULLY DESIGNEDDigiCal’s diary planner and organizer provides a clear and beautiful overview for your events and appointments.• Conveniently switch between 7 calendar views (day, week, week agenda, month calendar, text month, year and list view in portrait and landscape mode).• The slick dark theme allows for better visibility in low-light settings and night mode.• Event keyword image matching available in all 27 languages!• 6 highly customizable widgets with different theme styles and views: (FREE: list, day, day list, day grid widgets; PREMIUM: 2 extra widgets –text month and month calendar widget)• Intuitive navigation between days, weeks and months with zoomable day and week view. »

MemoCalendar.net is a light-weight and easy-to-use online calendar like a usual memo calendar on the wall. Behind every day a small note can be deposited. MemoCalendar.net is free and without registration (login) usable.

qOrganizer is a general organizer that includes a calendar with schedule,reminders,journal/notes for every day, to-do list.But provides features useful for students such as:timetable and a booklet for marks and absences.It's designed to be easy to use.

Quickly see the time until your next meeting from any of your calendars. Click on the button to be taken to your calendar.

Experience the ease of use of a weekly calendar in the palm of your hand! Easy Calendar is the new easy way to plan your day. Designed around frequent tasks, Easy Calendar allows anyone to create new events with just a few taps!

Zoho Calendar is a free online calendar application that helps you to track your appointments and meeting schedule, send invitation and track RSVP's, share and publicize your calendars. You can aslo access your Zoho Calendar from mobile phone.

MineTime is a free, modern desktop calendar app. Connect all your calendar services and let MineTime's Scheduling Intelligence help you optimize your time.MineTime works natively with Google Calendar, Outlook.com, Microsoft Exchange and Office 365: this means you can organize all your calendars directly in MineTime.

wtplan (web terminal planner ) helps you manage a calendar. The calendar can be managed from a command line interface and/or a web interface. The calendar data is stored in a simple text file. wtplan integrates with git to make backup and synchronization between multiple computers convenient.