Where can I find a list of vendors who sell sockets and packages (CQFP parts) that can be used with Xilinx FPGAs and CPLDs?
UG112, Device Packaging User Guide, contains a Table of Socket Manufacterers under Additional Information.
The table lists manufacturers known to offer sockets for Xilinx Package types. This summary does not imply an endorsement by Xilinx. Each user has the responsibility to evaluate and approve a particular socket manufacturer.