I had come across many posts on different forums where students ask for universities which do not require GRE scores...
There are many universities which do not require GRE scores. Many coaching sites and forums display the names of universities which do not require GRE scores from US citizens or from students who had done there undergraduation from US. However, for international students submitting of GRE scores is mandatory with the application, in these institutions.
Below is the list of universities which do not require GRE scores from international students too. For more details click on the link below the name of the respective university.
1. University of Dayton - GRE is optional for all engineering programs
http://gradadmission.udayton.edu/application/adm_scores.asp
2. Stevens Institute of Technology
http://www.stevens.edu/gradadmissions/programs/index.html
3. New Mexico state University
http://gradschool.nmsu.edu/admit-req.htm
4. University of Nebraska-Lincoln
http://engineering.unl.edu/academicunits/IMSE/graduate/graduate-FAQ.shtml
5. University of Pittsburg - GRE score not required for Materials Science and Engineering
http://www.engr.pitt.edu/admissions/graduate/gre.html
6. University of Northern Virginia in Manassas, VA
http://www.unva.edu/admin_req2.htm
7. Purdue University West Lafayette, Indiana
http://www.cs.purdue.edu/academic_programs/graduate/admission/requirements.sxhtml
8. MIT-massachusetts institute of technology - Electrical Engineering and computer science do not require GRE scores
http://www.eecs.mit.edu/grad/faqs.html#1
9. California State University Sacramento - don't require GRE for Civil Engineering
http://www.csus.edu/gradstudies/Faqa.htm#GRE_GMAT_MAT
10. University of Bridgeport, Connecticut - Master's of Science in Computer Science (M.S.), Computer Engineering (M.S.), Electrical Engineering (M.S.), Mechanical Engineering (M.S.), and Technology Management (M.S.) - GRE is recommended but not required
http://www.bridgeport.edu/pages/3664.asp
11. Oklahoma City University, Oklahoma - OCU does not require the GRE or GMAT examinations for entrance into the graduate programs, except for the MBA and MSA programs, which require the GMAT
http://www.okcu.edu/admissions/iso/questions.aspx