Google Calendar Checker!

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.

eM Client is a full featured email client with a modern and easy to use interface. - offers calendar, tasks, contacts and even chat.- fully optimized to run smoothly on Windows XP, Vista, 7, 8 and 10.- supports all major services including Gmail, Exchange, iCloud, and Outlook.com.- easily imports your data from most of the other e-mail clients. This includes Microsoft Outlook, Outlook Express, Windows Mail, Windows Live Mail, Thunderbird, The Bat and more.- fully supports touch devices like touch-enabled laptops, tablets and hybrid devices. Use your email client easily in a modern way.- finds any email, contact or attachment in seconds with eM Client's super-fast search. »

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. »

Rainlendar is a feature rich calendar application that is easy to use and doesn't take much space on your desktop. The application is platform independent so you can run it on all major operating systems: Windows, Linux and Mac OS X. The appearance can be customized with skins and you can even mix different skins together. It is possible to use Rainlendar with other calendar applications too. Rainlendar uses the standard iCalendar format to store its events and tasks so you can easily transfer them between applications. You can also subscribe to online calendars including the Google Calendar and edit your Outlook appointments directly in Rainlendar*. »

Android calendar-app showing the weeks of the year (week numbers), 21 languages, syncable with Google Calendar: FEATURES* intuitive navigation with smooth transitions* day, week & month calendar* 48 colors per calendar, per-event color if supported by the calendar (Android Jelly Bean with Google Calendar only)* flexible recurrences (e.g., every 3 weeks)* birthdays & anniversaries with photos from your addressbook and editing* Fullscreen widgets* custom event font size* uses Android's native calendar backend and synchronization* no battery drain* moon phases and zodiac signs for birthdays* QR barcode sharing of events* NFC sharing (if supported by the device) NEW* free* no adsTRANSLATIONSnative language support for English, Arabic, Czech, Danish, Dutch, German, Greek, Spanish, Finnish, French, Hebrew, Italian, Japanese, Korean, Polish, Portuguese, Russian, Slovak, Swedish, Turkish and Chinese with more to come »

Take control of your schedule and get reminded wherever and however you want. Instantly access your appointments, tasks, and notes with a simple glance at a transparent calendar that sits right on your Windows desktop. Share calendars and reminders in your home, office, or online. Automatically synchronize with Google Calendar and Outlook. Print calendars using a wide variety of layouts and styles. You can do all these things and much more with VueMinder Calendar.

This program helps you organizing your dates and tasks and reminds you of upcoming events.

This application is a software calendar with appointments notes, tasks, alarms and contacts that provides seamless integration and interactivity with the desktop background. You can organize your data in layers and share them with other people on a local area network.

BORG is a combination calendar and task tracking system. The calendar supports all sorts of appointments and also a simple todo list. The calendar functionality is similar to that of other PIMs, such as Microsoft Outlook, Mozilla Calendar, Palm Desktop, Yahoo Calendar, etc... The Task Tracker goes way beyond todo's and might better be called a project tracking system.

30 Boxes is an online calendering tool.

Share Calendars on a LAN and sync with Google Calendar.