The free and Open Source productivity suite
A free and powerful office suite
Take your office and CRM into the cloud!
A Comprehensive Alternative to Office 365 for Business
IGSuite is a web-ajax-based Integrated Groupware Suite
lawyer office suite
Secure, Browser-Agnostic ASP.NET PDF Viewer with DRM Features
SplendidCRM is like SugarCRM but designed specifically for Windows
Human way of Accounting
although fully functional, this is a pre-framework that you can extend