I will start with these ones:

  1. Buyers Meeting Point : Buyers Meeting Point offers open access, online knowledge, and professional  development resources for supply management and procurement professionals.  The editors and contributors monitor and filter the sources of information available to you. At this website, you can connect with peers, read thought leadership articles written by the editors, and find lists of service providers, publications, web-sites, and blogs—all geared to help professional buyers. The constantly updated  Events calendar keeps professionals up-to-date on relevant webinars and conferences. Kelly Barner, is the Managing Editor.