Web Based

activeCollab
Web based project management solution similar to basecamphq. [PHP]
http://www.activecollab.com/

Gizeh
Offers Web-based project and time management tool.
http://www.viatec.at/index/product_gizeh_overview_eng.htm

Iksana
Provides a project management system, including knowledge base, time and expenses tracking.
http://www.ideaweavers.com/

ProSys
Provides planning, reporting, messaging, documentation and bug-tracking.
http://www.scand.com/

Syndeo Project Server
Provides a web based collaboration platform for software development teams.
http://www.macadamian.com/

Top-Logic Framework
Business Operation Systems GmbH, Web based tools for project management and collaboration. Includes product and company information.
http://www.top-logic.com/

Trilogy Networks
Develops and designs complete web-based project management tools and software.
http://www.trilogynetworks.com

Virtual Worlds
Provides customized project management software and services, which include Web-based trainings, performance management, and developer tools.
http://www.virtualworlds.co.nz/

WBS Europe
European Distributor for Web TimeSheet and Promax time and expenses management systems.
http://www.wbs-europe.com/

Workplace Manager
Design Consultants, Inc. software for projects, work requests, costing, and time reporting. Web-based or LAN solution.
http://www.workplacemanager.com/