Lens  | Espacenet  | |
Indian Patent Search  | US Patent and Trademark Office  | 
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 Dimensions  | PubMed  | Crossref  | 
Google Scholar  | 
Retraction Watch Database  | 
Emerald Insight  | LOADB ( List of OA Database)  | Open Index Initiative  | 
Science Direct  | 
Learn Engg (Infoplus Technologies)-Polytechnic and Engineering Subject  | EBox (Amphisoft Technologies)-Employability Skills  | Talent Rank (Amphisoft Technologies)-Assessment and certification  | 
English Bolo (English Helper)-English Language  | Career Path Navigator (PerfecticeEduventurePvt Ltd)-Training Recommendation and Intervention  | Job Readiness (PerfecticeEduventurePvt Ltd)- Company Specific Mock and Preparation  | 
Codetantra- Learn Coding Onlinea) Hadoop: https://neat.aicte-india.org/course-details/NEAT2019183_PROD_1 b) Python: https://neat.aicte-india.org/course-details/NEAT2019183_PROD_2 c) Java: https://neat.aicte-india.org/course-details/NEAT2019183_PROD_3 d) C: https://neat.aicte-india.org/course-details/NEAT2019183_PROD_4 e) Data Structure: https://neat.aicte-india.org/course-details/NEAT2019183_PROD_5 f) C++: https://neat.aicte-india.org/course-details/NEAT2019183_PROD_6 g) Selenium 2.0:https://neat.aicte-india.org/course-details/NEAT2019183_PROD_7  | 
re3data.org – Registry of Research Data Repositories  | Open Access Directory (OAD)  | CORE -The world’s largest collection of open access research papers  | 
Open DOAR  | Dryad  | The Registry of Open Access Repository Mandates and Policies (ROARMAP)  | 
eScholarship ( University of California)  | Open Knowledge Repository (World Bank)  | Figshare  | 
Registry of Open Access Repositories  | 
bioRxiv – The Preprint Server for Biology  | TechRxiv -Preprints in Technology Research  | |
medRxiv –The Preprint Server for Health Sciences  | chemRxiv –The Preprint Server for Chemistry  | 
Research Square  | CogPrints  | OSF PrePrints  | 
Authorea  | PrePrints  |