ActiveGcSync is a free utility that synchronizes Google Calendar to a Windows Mobile device. Two-way synchronization is done, and ActiveGcSync supports running in the background and auto-updating the calendars on a schedule.
ActiveGcSync has been tested on Windows Mobile 5.0, but its possible that it will work on other Windows Mobile operating systems.Installation Instructions:
Download the ActiveGcSync CAB file to your device. You can do this either by transferring it from your PC or downloading it using the internet browser on your device.

ActiveSync... that wonderful Microsoft program for synchronising data between your PDA and PC. It loads itself automatically, syncs your PDA with your PC, then sits there, patiently waiting to synchronise any piece of data that you change.
So whats with this ActiveSync Toggle then...
Well, annoyingly (at the time of writing) Microsoft have yet to include a facility to Load ActiveSync at Startup or even an Exit option from the System Tray Icon.

Microsoft ActiveSync 4.5 is the latest sync software release for Windows Mobile-powered devices.
ActiveSync provides a great synchronization experience with Windows

Use AvantGo to synchronize specially designed mobile Web sites to your handheld using a desktop or wireless Internet connection.
Get news, sports, stocks, movie listings from the worlds top brands.
Even designate your own favorite Web sites (workout schedules, family Web sites) to synchronize to your handheld.Update
Includes support for Active Sync 4.0

CABviaActiveSync is a utility which turns any installation of a CAB file much quicker. It appears as a new entry in the context menu of your desktop explorer.
When you click this option, CABviaActiveSync executes several tasks:
- It copies the CAB file to your ActiveSync directory.
- It begins the install launching CEAPPMGR.EXE.
It could not be easier to use, and thanks to this utility, I got rid of copying CABs to Pocket PC, clicking in the file explorer, copying the CAB file to a secure place if I need reinstalling, etc.

FinchSync is a tool for synchronizing contacts, appointments and tasks from Mozilla email and calendar products with a Pocket PC or SmartPhone.
Contacts are synchronized with the email clients address book. The build-in applications of the Netscape- and Mozilla Application Suite are supported as well as the standalone Mozilla Thunderbird.
Contacts and tasks are synchronized with the Mozilla Calendar extension for the Mozilla Suite, Firefox and Netscape or the standalone Sunbird (only Version 0.

GMobileSync allows you to remotely synchronize Google Calendar events to your Windows Mobile 5.0 device using its local internet connection.
Features:
- Sync Google Calendar events to PocketOutlook without ActiveSync.
- Choose a range of days to sync based on todays date.
- Automatically exit GMobileSync when complete, for fast synchronizations.
- Set your local Timezone Offset.
- Remove all Google Calendar events from PocketOutlook without disturbing any manually entered events.

Synchronization between Pocket PC and vcs/ics - sntp & weather.
Features:
- Copy vcs/ics from web server or local file to your pocket pc calendar and erase/replace currents appointments.
- Have the last weather report in your calendar.
- Synchronize your computers clock with any Internet atomic clock using network time protocol (NTP) which provides accuracy of several milliseconds.Update
v0.8:
- Could import local vcs file.

This freeware application will kill the MS ActiveSync icon from the system tray and prevent ActiveSync from loading again until you run it again.
To use, when you are done using MS ActiveSync simply run this application and select "Kill ActiveSync".
It will then stop the program from running and prevent it from starting up on next reboot.
ActiveSync can be run again by clicking its shortcut.

OggSync is pleased to announce OggSync suite of products. For those with limited needs, OggSync basic will provide the Google Calendar user with full two way synchronization with no 3rd party involved! Direct form Google to your phone!
OggSync freeware provides the following features:
- Two Way Syncrhonization.
- Sync repeating events including EXCEPTIONS.
- Mobile direct to YOUR CALENDAR, NO MIDDLE SERVER.
- Sync unlimited number of events.