Google Scholar indexes and provides citation counts for a wide range of scholarly publications that may not be included in other databases, including theses, books, reports, conference papers, posters and patents. Authors can set up a free Google Scholar Citations profile which will automatically graph citations to their works over time, and calculate an h-index and i10-index.
Google Scholar Metrics summarises recent citations to publications to provide a number of lists including: Top 100 publications lists by language, and Top 20 publications by research areas and specific subcategories (English only). Access is free. It displays the h5-index and the h5-median for each included publication.
Microsoft Academic Search is a free search engine that indexes multidisciplinary scholarly content. Researchers can create a personal profile which lists their publications and provides traditional metrics including their number of citations, as well as alternative metrics such their number of collaborators. Other features include citation graphs and tools to explore scholarly networks.
Publish or Perish is free downloadable software that retrieves Google Scholar and Microsoft Academic Search data. It provides many metrics for your search results including the total number of papers and citations, average number of citations per paper, average citations per author and paper, Hirsch’s index and related metrics, Egghe’s g-index, an age weighted citation rate. It also provides tools to look at author level impact and co-citation analysis.
Scholarometer is a free tool for citation analysis (based on more traditional metrics but including more research outputs than just journal articles). It works as a browser extension that supports Firefox and Chrome to provide an interface for Google Scholar data. It provides similar functionality to Publish or Perish and impact data can also be published as linked data. You can also explore information on the Scholarometer website including top authors, discipline statistics and author networks. You just need to download the browser extension to get started.