| AgNIC | offer access to agricultural information and sources |
| Agriscape | a directory on agriculture and its surrounding industry |
| Biocrawler | an encyclopedia written collaboratively |
| BiologyBrowser | offering resources for the life sciences information community |
| BUBL Information Service | catalogue of Internet resources |
| Computer and Information Science Papers | scientific literature digital library and search engine |
| Energy Citations Database | access to DOE publicly available citations |
| Engineering Village | Web-based information service that offers a wide range of quality resources for information specialists |
| FindArticles | access to articles from top publications |
| Forest Conservation Internet Search | Searches of Forest, Rainforest and Biodiversity Conservation Information |
| Google Scholar | buscar bibliografía especializada |
| Index to Organism Names (ION) | organism names database |
| Information Bridge: DOE | free public access to full-text documents |
| ISI Web of Knowledge | provides high-quality content and the tools to access, analyze, and manage research information |
| National Science Digital Library | online library for education and research in Science |
| OAIster | union catalog of digital resources |
| OVID | metabuscador |
| PubList | only Internet-based reference |
| Science.gov | search engine for government science information and research results |
| ScienceResearch | allowing access to numerous scientific journals |
| SCIRUS | science-specific search engine |