RePEc (Research Papers in Economics)
This is a collaborative effort of volunteers to create a decentralized database of working papers, journal articles and software components. Materials in this database are freely available.
Part of RePEc, EconPapers provides access to economics working papers, journal articles and software.
AgEcon (Research in Agricultural and Applied Economics)
AgEcon is a free-to-use web site which contains many full text working papers, conference papers, and journal articles from academic institutions, government agencies, professional associations, and non-governmental organizations.
CIAO (Columbia International Affairs Online)
Working papers, research papers, and conference proceedings in international affairs.