Linux

Hi Manish,
There are various courses related to Computer software and application it generally depends upon your taste of interest.
Some of the certification options are:
Java/J2EE - The server side software development of web is mostly done by this most secure language option. Most of the banks in India and abroad implement their web applications using Java/J2EE only.
.NET - This is among most popular languages which are direct counterparts of Java. These are mainly used for light weight application development on the server side and client side. .NET is also easy to master compared to the long Java Library.
The other options for the courses include, i am listing most prominent ones from job point of view:
Oracle/Mysql/DB2/DBA - This is one of the most reliable course options but you will not get any work of software development on its basis, yet you can continue doing it if you have interest in DBMS.
CCNA/MCSE - These networking certifications can employ you as a network engineer and again even in the recession period these were the most reliable career options, if not most exciting.
Between java & .NET i would suggest .NET and you being from ECE branch, Networking courses like CCNA should be easier for you.
Here is the list of certification courses which one can pursue after completing their graduation:
SAP/ERP: The course is designed for aspirants who wish to make their career in the IT industry. This program enables Transparency for Management, One solution for better management, Cost control & lower working capital, Critical control & visibility of inventory, Effective utilization of recourses, To marry latest technology, Shun the geographical gap, Satisfy the customer with high expectation, To be competitive & for survival.
Multisoft Systems offers PLC and SCADA (Supervisory Control and Data Acquisition). The course imparts theoretical and practical knowledge in the Technical domain.
Refer to the below link to know about the institutes offering Cisco Certification:
https://it.shiksha.com/cisco-certification-courses-in-india-categorypage-10-101-1-0-0-1-1-2-0-none-1-0
Refine the search as per your state preference.
Hope this helps,
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Thanks.
All The Best!