The Xilinx Virtex 7 FPGA bitstream has been reverse engineered by Clifford Wolf:
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https://github.com/SymbiFlow/prjxray
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Note especially here:
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Tools & Libs
Tools & libs are useful tools (and libraries) for converting the resulting bitstreams into various formats.
Binaries in the tools directory are considered more mature and stable then those in the utils directory and could be actively used in other projects.
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Probably the only project, and an active one at that for this particular architecture. But some of the tools in there might convert the bitstream into something readable enough, or at least readable by another tool.