Description: PDFsam is an open-source PDF editing software that allows users to merge, split, rotate, mix and extract pages from PDF files. It has a graphical user interface and offers basic PDF manipulation functionalities for free.
Type: software
Pricing: Open Source
Description: ResearchGate is a social networking site for scientists and researchers to share papers, ask and answer questions, and find collaborators. With over 19 million members, it allows researchers to connect with others in their field and discover research from around the world.
Type: software