Publish or PerishPublish or Perish is a free software program that retrieves and analyzes academic citations. It uses a variety of data sources to obtain the raw citations, then analyzes these and presents a range of citation metrics, including the number of papers, total citations and the h-index.
You can also use Publish or Perish to decide which journals to submit to, to prepare for a job interview, to conduct a literature review, to do bibliometric research etc