这算是一个增强型iCal程序，该软件能让用户方便、有效的共享日历上的一个局域网和互联网,而不需要有一个独立的服务器,同步谷歌的日历。

并且可以查看和编辑多个用户和用户间同步。

BusyCal v3.x Mac OS X | 8.2 MBBusyCal is an alternative to the built-in Calendar app on OS X that provides powerful time-saving features in a friendly, easy-to-use package.

BusyCal's unique features include customizable calendar views, scrolling Month and Week views, an integrated Info Panel for quickly viewing and editing events, integrated To Dos that display in the calendar and carry-forward until completed, custom font sizes and styles, graphics, live weather feeds and moon phases, and a menu bar app for quick access to the current day's events and weather.

BusyCal supports iCloud, Exchange, Google Calendar, and other CalDAV servers, enabling you to sync and share your calendars with other Macs running BusyCal or the built-in Calendar app on OS X, as well as iPhones and iPads running the built-in Calendar app on iOS.

Key FeaturesCalendar ViewsDisplay your calendar by Month, Week, Day, Year or ListCustomize the number of weeks shown per month, or days shown per weekList view displays custom date ranges and columns, including automatic totaling of hours for time billingWeather, Graphics, Holidays and BirthdaysDisplay a live 10-day weather forecast and moon phasesDrag-n-drop images into your calendar with the new Graphics paletteDisplay stylized Holidays, Birthdays, and AnniversariesCustomize event fonts, sizes, styles and colorsManage To DosTo Dos can be displayed directly in your calendar and carry-forward until completedControl the date range and sorting of To Dos in the To Do ListCreate repeating To DosTo Dos in BusyCal are compatible and sync with the Reminders app on OS X and iOSInfo PanelInfo panel allows you to view and edit event details directlyCustomize the fields shown, such as Location, Time Zone, Tags, and Last edit timeAdjust dates and times with arrow keys or the new date pickerProductivityArrange calendars into Groups and instantly show/hide them with a single clickCreate Smart Filters to display a set of calendars, a custom view, or events that match a certain criteriaUse tags to track important events, projects or clientsBusyCal MenuDisplay today's events and weather forecast in the menu barView event details, mark a To Do as completed, or create new events using natural languageDisplay the menu with a shortcut keyAlarmsAlarms may displayed in the BusyCal Alarm Window or the Notification CenterSnooze alarms for any duration, including x minutes before startSet default alarm intervals for new Events, To Dos, All-Day Events, and Birthdays & AnniversariesSync and Share calendarsSync and share calendars with iCloud, Exchange, Google Calendar, and other CalDAV serversView free/busy time of Attendees in the Availability Panel when performing Exchange and CalDAV meeting schedulingInbox displays notifications of meetings and changes made to events on shared calendarsShare calendars on your LAN with other BusyCal usersiPhoneSync BusyCal with the iPhone, iPad or iPod Touch through iCloud, Exchange or Google CalendarEvents in BusyCal sync with the iOS Calendar appTo Dos in BusyCal sync with the iOS Reminders appMoreCreate automatic backupsSet default calendar, start time and duration for new eventsNew Find window lets you search your entire calendar independent of the current viewOption to display a warning when modifying an event on a shared calendar