DoCD 5.20 could be downloaded from the developer's website when we last checked. We cannot confirm if there is a free download of this software available. The program lies within Development Tools, more precisely IDE. We recommend checking the downloaded files with any free antivirus. This program is a product of Digital Core Design.
From the developer:
DCD on Chip Debug System (DoCD) prominently cuts debugging time. Integrating DCD IP Cores with a Hardware Assisted Debugger and Debug IP Core ,provides a powerful SoC development tool,with advanced tool,with advanced features.
The DoCD system consists of three major blocks:
-debug IP Core
-hardware assisted debugger
-debug software
You may want to check out more software, such as GnuWin32: LibIconv, SpinnerDemo or SplitPaneDemo, which might be related to DoCD.