Gartner is a lead tech industry analyst firm, focusing on business IT, hardware, software and cloud computing, both in the US and abroad.
GigaOM is a group of tech industry analysts who blog about the Silicon Valley startups.
eMarketer studies the demography of the tech industry both in the US and abroad.
IT is pervasive in the business world. Consult these databases if you are looking to research a tech company, a particular IT application or concept.