Based on the same code base as QuickTime Streaming Server, Darwin Streaming Server provides a high level of customizability and runs on a variety of platforms allowing users to manipulate the code to fit their needs.
QuickTime Streaming Server (QTSS) is Apple’s commercial streaming server delivered as part of Mac OS X Server. QTSS provides users with enhanced administration and media management tools as a result of the tight integration with Mac OS X Server; these tools are not available as part of the open source project. Technical support is available for QTSS as part of the AppleCare support plans provided for Mac OS X Server and Xserve.
Both DSS and QTSS are built on a core server that provides state of the art quality of service features with Skip protection and Instant-On, and support for the latest digital media standards, MPEG-4 and 3GPP.
Darwin Streaming Server is available as a free download under the Apple Public Source License.
More info about Darwin Streaming Server 5.5.5 and download links, including server and proxy source code, Mac OS X Streaming Server and Streaming Proxy, Linux Streaming Server and Streaming Proxy for Fedora Core 4 and later, and Windows Streaming Server for Windows 2000/2003 Server can be found here.