Banff International Research Station for Mathematical Innovation and Discovery (BIRS)
BIRS is one of the world's most prominent mathematical science research institutions, hosing 2,100 researchers from 400 institutions (and more than 60 countries) every year. You can find out more about BIRS by checking gout their website. BIRS Workshop Lecture videos are primarily focused on research in mathematics, statistics, and theoretical computer science, and publicly archived in UBC's cIRcle repository.
Cornell University Library arXiv.org
arXiv is an e-print (electronic pre-print) service that provides open access to almost 1.3 million e-prints in Physics, Mathematics, Computer Science, Quantitative Biology, Quantitative Finance and Statistics. It is owned and operated by Cornell University.