Scientometrics (citations & co)

ISI Web of Science
ISI Web of Science provides quick, powerful access to the world's leading citation databases. The multidisciplinary content covers over 12,000 of the highest impact journals worldwide, including Open Access journals and over 150,000 conference proceedings.
https://webofknowledge.com/

Google Scholar
Google Scholar provides a simple way to broadly search for scholarly literature. From one place, you can search across many disciplines and sources: articles, theses, books, abstracts and court opinions, from academic publishers, professional societies, online repositories, universities and other web sites. Google Scholar helps you find relevant work across the world of scholarly research.
http://scholar.google.com

ScopusĀ®
Scopus is the largest abstract and citation database of peer-reviewed literature: scientific journals, books and conference proceedings.
www.scopus.com

Harzing's Publish or Perish
The website provides resources to assist with academic publishing and the assessment of research and journal quality, as well as software to conduct citation analysis.
www.harzing.com

Scholarometer
An interactive platform independent browser extension that provides a smart interface for Google Scholar, which empowers non-experts to submit complex queries and maintains their history, allowing filtering, sorting, deleting and live search to compute error free impact measures.
http://scholarometer.indiana.edu/help.html

Thomson Reuters Impact Factor
The original essay published in 1994.
http://thomsonreuters.com/products_services/science/free/essays/impact_factor

Thomson Reuters Journal Citation Reports
Journal Citation Reports offers a systematic, objective means to critically evaluate the world's leading journals, with quantifiable, statistical information based on citation data. By compiling articles' cited references, JCR Web helps to measure research influence and impact at the journal and category levels, and shows the relationship between citing and cited journals.
https://jcr.incites.thomsonreuters.com/

Toolkit for the impact of Digitised Scholarly Resources
This toolkit was originally developed by the Oxford Internet Institute in 2008 to explore the questions: are digital resources succeeding at reaching their intended users? Are they having an impact on their community of users? How can impact be measured?
http://microsites.oii.ox.ac.uk/tidsr/kb/bibliometrics-/-scientometrics