For one of my PHP project, I have written a class to import contacts from Gmail and Hotmail address book and at the same time search in web for others email provider such as Gmail, Hotmail etc. to save my time. Then I found an excellent open source plugins to import contacts (address book) named OpenInviterTM.
It is written in PHP5 and free for all. Anyone can customize and use it easily. Also it has ‘Tell a friend’ features. Currently it supports:
- 57 Email Providers
- 21 CMS
- 45 Social Network Applications