Do these universities require GMAT, and am I eligible to apply without it in UK for a Master's?

Yes, most UK universities do not require a GMAT score for master's programs in Computer Science. With your BTech in Computer Science (7.52 GPA) and no work experience, you are generally eligible to apply without GMAT.

Some highly competitive programs may still ask for GMAT or GRE scores, but this is not common in your field. Always check specific program requirements, as a few exceptions exist.

Focus on highlighting your academics, projects, and internships. A strong statement of purpose and good recommendation letters will further strengthen your application.