Calendar is your life. Here are five of the best calendar apps for the Android. Each of these apps works with Google calendars, and some even work with Exchange.

1. Touch Calendar includes plenty of features that take advantage of the Android 2.0 interfaces, such as pinch zooming and long tap. Other features include: double tap to enter events (if you’re not a fan of long tap), horizontal and vertical scrolling, jump to any date from menu, search calendar from either the phone search button or from menu, and much more. A widget would place Touch Calendar above all other calendar apps for the Android phone.

2. Cal Widget isn’t so much a stand-alone calendar as it is a widget for the built-in calendar. Not only does it offer a size configuration to fit just about any free spot on a home screen, but it also allows you to control the transparency of the background colors of nearly all aspects of the widget. When you click on the Cal Widget, three buttons open up: Refresh, Google, and Config. If you want to actually interact with the calendar, you have to click the Google button, which will then open up the built-in calendar app where you can add, remove, and edit appointments.

3. Smooth Calendar is a simple to use, clean, highly configurable screen widget for the built-in calendar application. Smooth Calendar sets itself apart from widget-only apps by allowing you to select only the calendars you want to display and allowing you to very granularly configure the display. Your calendar widget will display in one of two modes: Simple (only three calendar items with just the event names) or Detailed (one event with details).

4. Agenda Widget allows you to directly input events into your calendar. Agenda Widget works with the built-in calendar application, but it does not require the opening of the built-in application in order to add an event. This application will also interact with Exchange via the third-party TouchDown application. With Agenda Widget, you can also set it up to have separate widgets for each calendar.

5. Fliq Calendar is a calendar application that works in conjunction with Missing Sync to connect your Android phone with your desktop Outlook. This calendar is perfect for those who do not have an Exchange server but still want to keep in sync with their Outlook calendar. The interface is simple to use, and it is about the closest look and feel to an Outlook calendar you will find on Android.