You can surely look up for the following options for MTech admission without gate:

IIIT Hyderabad PGEE-Test in April end, interview in June

IIIT Delhi- Test and interview in first week of June, after shortlisting on the basis of BTech percentage

IIIT Bhubaneswar- Test in May end

BITS Pilani HD -Test in May

BIT Mesra- Test in July

Delhi University (electronics only) -Test and interview/GD in mid June

JNU - Test in December

IPUCET, Delhi- Test in May

Jamia Millia islamia, Delhi - Test in June beginning

Other options include- IIITM Kerala, NIST Odisha, NITTTR, NICMAR

State level exams include- CUCET(for various states),TANCET(Tamil Nadu),PGCET( Karnataka), APPGECET (A.P.)

Private college exams include- VITMEE, SRMGEET, UPES,DAIICT,COEP ,KIITEE

HBTU, Kanpur and NSIT, Delhi also admit non gate students against vacant seats

Institutes like NIT Raipur and NIT Jammu also admitted non gate students recently after spot round of CCMT. You can keep a check.

You can also take sponsored seats at IITs/NITs and other institutes without gate if you have some work experience

Teachers can apply for MTech under the quality improvement program

Hope you find it helpful

let me know in the comment box if you are having any further doubts

thanks

Good Luck!