gcalcli - Google Code
gcalcli is a Python application that allows you to access your Google Calendar from a command line. It’s easy to get your agenda, search for events, and quickly add new events. Additionally gcalcli can be used as a reminder service to execute any application you want.
Popularity: 28% [?]
The Google Email Uploader is a open source desktop utility for Microsoft Windows. It uploads email and contacts from desktop email programs (like Microsoft Outlook® ) into your Google Apps mailbox. It preserves information such as sent dates and sender/recipient data, as well as the folder structure used by email programs.
Popularity: 41% [?]
I’ve just discovered that the excellent plaxo also offers mac software which can sync ical with any of their other supported “sync points” (google calendar, outlook, yahoo, mobile phones, etc).
A standard account is free as well, although it’s one of the only web 2.0 services I’d pay for.
Popularity: 26% [?]
Official Google Blog: Google Calendar Sync
Google have now released a tool to sync your google calendar with Outlook!
Popularity: 20% [?]
Why does google’s alternative to paypal use the same password as you use for all other google services? Considering it has your credit card details I suggest a secondary means of authentication.
Really it should offer OpenID as an option for secondary authentication 
Popularity: 16% [?]
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