| Wikibooks | Collection of free, open-content textbooks |
| Bartleby | Free of charge access to books and literature from references and verses to fiction and nonfiction |
| Scienceticker | Aktuelle Nachrichten aus Forschung, Wissenschaft und Technik.
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| Journal and Country Rank | Portal that includes the journals and country scientific indicators |
| Wikipedia- Online Enzyklopädie | Freie Enzyklopädie. Zahlreiche Artikel. Möglichkeit zur Mitarbeit. |
| How stuff works | There are some many interesting things in the world - but how do they work ? |
| Markenmuseum | Interessante Geschichten zur Entstehung der bedeutenden Markennamen der Zeitgeschichte. |
| Geldmuseum | Wissenswertes über Geld im Allgemeinen und Münzen und Zahlungsmittel vom Altertum bis heute. |
| Philica | Instant academic publishing with transparent peer-review |
| Scientific American | Online presence of the science and technology magazine |
| Oxford Journals | International publisher of academic and research journals |
| Max Planck Gesellschaft e.V | Unabhängige gemeinnützige Forschungsorganisation zur Förderung der Wissenschaften mit zahlreichen eigenen Instituten |
| Blackwell Publishing | Publisher for scientific publications in many journals. |
| Fundus.org | Referate-Datenbank. Etwa 10.000 Referate zu diversen Wissenschaftsgebieten. |
| Wikia | Platform that hosts many different wikis and which allows you to create a wiki of your own. |
| Studienpreis "Arbeit" | Hochdotierter Studienpreis der Körber-Stiftung zum Thema "Arbeit". |
| Peer to patent | Community patent review in cooperation with the US Patent and Trademark Office (USPTO) |
| Similar Mind Tests | Collection of free personality tests and tools |
| Warum ist der Himmel blau? | Informationen und Fotos zu optischen Phänomenen in der Atmosphäre |
| Lehmanns Fachbücher | Online-Fachbuchhandlung für Medizin, Naturwissenschaften, Recht und Wirtschaft |
| Questel | Suite of patent, trademark and design services to executives, researchers, and competitive intelligence professionals |
| Innocentive | companies offer rewards for solving research and development challenges found on this page |
| citeUlike | Free service for academics to share, store, automatically extract citation details and organise the academic papers. |
| Flag Database | The flags of the world sorted alphabetical with a short basic information on the countries |
| Learning for Kids | Online Lessons and dictionaries for children dealing with themes as biology, languages, physics, geography and history. |