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Hoover's (Now D&B Hoovers)
Use "build a list", or, find a company you are interested in, then check “competitors” on left hand side. Is international. No downloading, but has company profiles.
ReferenceUSA (now Data Axle)
Various modules: US and Canadian companies of all sizes, consumer data, job postings, healthcare offices, personal listings, new business filings, with data visualization and mapping applications. For in depth research: the OneSource module has extensive corporate information on over 5 million global firms.
US private company financials, information on private M&A deals, valuations, venture capital, private equity, etc. Good for locating investors and competitive intelligence. NOTE: You must create an account using your CMU email. Use of this database is for academic purposes only.
A comprehensive global database of private companies and investors activities. Contains advanced searches for private companies, investors, and deals information (especially private equity and venture capital). Also great for news on emerging markets. An excellent resource for startups and entrepreneurship research. (NOTE: You must create an account using your CMU email).
LexisNexis Corporate Affiliations (now incorporated into Nexis Dossier)
corporate hierarchies and linkages for all major public and private companies and their subsidiaries worldwide. Provides business profiles and contacts. Creates lists of foreign firms operating in the US and vice versa.
Salary and relocation information
There are hundreds, but these seem to be the most recommended:
comprehensive international job search site; also gives salary and employment trend data.
thousands of jobs from the US government's official site for federal employment, in every field
Large internship marketplace, including paid and unpaid, full and part-time internships in the US.
comprehensive international job search site; also gives salary data.
Full information, including financials, on all nonprofits in the US. To get full advantage, register first (it's free). Use "Advanced Search" for best results.
Universities and Research Centers