FullContact
Freemium
FullContact gives you all the power of your address book, right in your Gmail inbox.
Kontact
Open Source
Kontact is a personal information manager and groupware software suite developed by KDE. It supports calendars, contacts, notes, to-do lists, news, and email.
Google Contacts
Free
Google Contacts is Googles contact management tool that is available in its free email service Gmail.
FCorp ID Book
Free
FCorp ID Book is a portable, light but powerful address book.
Compare Contacts with alternatives
Compare FullContact and Contacts and decide which is most suitable for you.
Compare Google Contacts and Contacts and decide which is most suitable for you.
Compare FCorp ID Book and Contacts and decide which is most suitable for you.