Encyclopedia
| Science & Technology | Tech Encyclopedia |
| Linux Software Encylopedia | |
| Grey's Encyclopedia-Computer Languages | |
| Computer Desktop Encyclopedia | |
| PC Webpedia | |
| Info Please Encyclopedia | |
| Free Internet Encyclopedia | |
| Kevin's Internet Encyclopedia-Bookshelf | |
| Finance | International Financial Encyclopedia |
| Philosophy | Internet Encyclopedia of Philosophy |
| Stanford Encyclopedia of philosophy | |
| Encyclopedia Mythica | |
| Mathematics/Statistics | Sholen Online Enclopedia of Integer |
| Telecommunication | Jones Telecommunication & Multimedia |
| Thermodynamics | Encyclopedia of Thermodynamics |
| General & Others | Encyclopedia Britannica |
| Goiler Online | |
| Altapedia | |
| Encyclopedia Brady | |
| Global Encyclopedia | |
| LetsFind.com |