"As information professionals, we live in very interesting times. Effective search and discovery over open and hidden digital resources on the Internet remains a problematic and challenging task. The difficulties are exacerbated by today's greatly distributed scholarly information landscape. This distributed information environment is populated by silos of: full-text repositories maintained by commercial and professional society publishers; preprint servers and Open Archive Initiative (OAI) provider sites; specialized Abstracting and Indexing (A & I) services; publisher and vendor vertical portals; local, regional, and national online catalogs; Web search and metasearch engines; local e-resource registries and digital content databases; campus institutional repository systems; and learning management systems."
Awesome Library organizes the Web with 37,000 carefully reviewed resources, including the top 5 percent in education. You can search according to different relevant catagories or as a teacher, parent, kid....