SPARQL Federated Query Clients

Dear colleagues,

Could you please list the SPARQL clients (preferably open-source/free) that
allow federated querying (i.e., SERVICE clause)?

Thanks,
- Jyoti

-- 
Jyotishman Pathak, PhD
Assistant Professor of Biomedical Informatics
Division of Biomedical Statistics and Informatics
Department of Health Sciences Research
Mayo Clinic College of Medicine
Rochester, MN 55905, USA
Phone: +1-507-538-8384
Fax: +1-507-284-0360
Email: pathak.jyotishman@mayo.edu<https://mail.google.com/mail/pathak.jyotishman@mayo.edu>