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Project UDI
Uniform Driver Interface

UDI Products & Reference Implementations

The initial, prototype, UDI implementations were done as Proof-of-Concept exercises, to validate the specifications as they were being drafted. The resulting code base was then evolved into a Reference Implementation, which will shortly be released as Open Source (using a BSD License), and which also forms the basis of a number of product and preview offerings from various system software and hardware vendors.


The following directory is provided by Project UDI, free of charge, as a central resource for locating publicly-available (both free and non-free) implementations, as well as other UDI-related products and services. To add or update a listing, send email to


Reference Implementation

Open source project and BSD-licensed source code. Includes highly-portable source code for several operating system environments, as well several 100%-portable UDI sample drivers. Find it at


Environments & Driver Development Kits


Device Drivers



  • [Placeholder for standalone metalanguage & utility libraries.]


Training & Services