zotero is a free, easy-to-use tool to help you collect, organize, cite, and share research.

github is where over 100 million developers shape the future of software, together. contribute to the open source community, manage your git repositories, review code like a pro, track bugs and features, power your ci/cd and devops workflows, and secure code before you commit it.

stack overflow is the largest, most trusted online community for developers to learn, share​ ​their programming ​knowledge, and build their careers.

your home for data science. a medium publication sharing concepts, ideas and codes.

ilovepdf is an online service to work with pdf files completely free and easy to use. merge pdf, split pdf, compress pdf, office to pdf, pdf to jpg and more!

collaborate for free with online versions of microsoft word, powerpoint, excel, and onenote. save documents, workbooks, and presentations online, in onedrive. share them with others and work together at the same time.

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kaggle is the world’s largest data science community with powerful tools and resources to help you achieve your data science goals.

collaborate for free with online versions of microsoft word, powerpoint, excel, and onenote. save documents, workbooks, and presentations online, in onedrive. share them with others and work together at the same time.

a computer science portal for geeks. it contains well written, well thought and well explained computer science and programming articles, quizzes and practice/competitive programming/company interview questions.