Alternative Versions and Implementations
COMsource. Its source code is available, along with full and complete documentation, sufficient to use and also implement an interoperable version of DCOM. According to that documentation, COMsource comes directly from the Windows NT 4.0 source code, and even includes the source code for a Windows NT Registry Service.
The Wine Team is also implementing DCOM for binary interoperability purposes; they are not currently interested in the networking side of DCOM, which is provided by MSRPC. They are restricted to implementing NDR (Network Data Representation) through Microsoft's API, but are committed to making it as compatible as possible with MSRPC.
TangramCOM is a separate project from Wine, focusing on implementing DCOM on Linux-based smartphones.
The Samba Team is also implementing DCOM for over-the-wire interoperability purposes: unlike the Wine Team, they are not currently interested in binary-interoperability, as the Samba MSRPC implementation is far from binary-interoperable with Microsoft's MSRPC. Between the two projects, Samba and Wine, tackling interoperability from different angles, a fully interoperable implementation of DCOM should be achievable, eventually.
j-Interop is an open source (LGPL) implementation of MSRPC purely in Java, supporting DCOM client applications in Java on any platform communicating with DCOM servers.
J-Integra for COM is a mature commercial pure Java implementation of the DCOM wire protocol allowing access to COM components from Java clients, and Java objects from COM clients.
EntireX DCOM is a commercial implementation by Software AG for AS/400, BS2000/OSD, Windows, Unix (AIX, HP-UX, Linux, Solaris), z/OS, and z/VM.
Read more about this topic: Distributed Component Object Model
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