Mendeley
Description: Mendeley is a free reference manager and academic social network that can help you organize your research, collaborate with others online, and discover the latest research. It provides tools to manage references and citations, read and annotate PDFs, and create online groups and networks to share research papers and collaborate.
Type: software
Pricing: Freemium
Notability
Description: Notability is a popular note-taking and annotation app for iOS and macOS. It allows users to take handwritten notes, type notes, record audio, annotate PDFs and more. Key features include advanced organization with search and tagging, auto-backup to the cloud, and easy sharing options.
Type: software
Pricing: Paid