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Google Scholar is a freely accessible web search engine that indexes the full text or metadata of scholarly literature across an array of publishing formats and disciplines. . Released in beta in November 2004, the Google Scholar index includes peer-reviewed online academic journals and books, conference papers, theses and dissertations, preprints, abstracts, technical reports, and other ...
Open access logo, originally designed by Public Library of Science. A PhD Comics introduction to open access. Open access ( OA) is a set of principles and a range of practices through which research outputs are distributed online, free of access charges or other barriers. [1]
Project Gutenberg ( PG) is a volunteer effort to digitize and archive cultural works, as well as to "encourage the creation and distribution of eBooks ." [2] It was founded in 1971 by American writer Michael S. Hart and is the oldest digital library. [3] Most of the items in its collection are the full texts of books or individual stories in ...
The main academic full-text databases are open archives or link-resolution services, although others operate under different models such as mirroring or hybrid publishers. Such services typically provide access to full text and full-text search, but also metadata about items for which no full text is available.
Google Books (previously known as Google Book Search, Google Print, and by its code-name Project Ocean) [1] is a service from Google that searches the full text of books and magazines that Google has scanned, converted to text using optical character recognition (OCR), and stored in its digital database. [2]
Nitro PDF Reader: Extracts Images in original resolution. PDF-XChange: PDF Tools and PDF-XChange print driver allow conversion from many formats to PDF. A "lite" version of the print driver is free for non-commercial (home and academic) but places a watermark on documents; Qiqqa: Converts Microsoft Word document and Web Pages to PDF.