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- Xenocs SAS
- XLAB
- XLAB d.o.o.
- XLIM
- XLNS Research
- XWiki SAS [Paris, France]
- Xebia Nederland [Hilversum]
- Xeno-canto foundation
- Xerox Company
- Xerox Research Centre Europe [Meylan]
- Xi'an Jiaotong University
- Xi'an Jiaotong-Liverpool University [Suzhou]
- Xi'an University of Science and Technology
- Xiamen University
- Xiangtan University