Mendeley is a free academic software used for managing, sharing, reading, annotating, and citing research papers, developed by a team of researchers and software developers in London. It allows users to create a personal library, organize documents, and sync with other reference management tools, while also offering features like citation generation in various formats and group sharing capabilities. Additionally, Mendeley provides a web importer to easily add references from online sources and supports integrated document viewing and full-text search functionalities.