Google Contacts - Google Contacts is Google's contact management tool that is available in its free email service Gmail, as a standalone service, and as a part of Google's business-oriented suite of web apps Google Apps.
Feng Office - Feng Office is a commercial Open Source web based solution aimed to enhance collaboration and productivity
Open Contacts - Open Contacts is an advanced address book program for managing contact info of individuals and...
LibreOffice - Free office suite, open source, and compatible with .doc, .docx, .xls, .xlsx, .ppt, .pptx files. Updated regularly – download for free. Originally based on OpenOffice.org.
FullContact Card Reader - Automagically scan biz cards into LinkedIn/Gmail contacts
Redmine - Flexible project management web application