Here at Social Sector Service Delivery, we use a combination of Sharepoint 1.1 (got it for free), PostNuke (open source) and NetOffice (for project management, also open source). This uses 2 web servers (Apache and IIS 5.1) running on ports 80 and 8888. For a web-based help desk and asset management system, we use Ilient (free for 100 clients) running