| Source | Description |
| Wikipedia(en) | Contains over 6 million articles written by non-specialists. Leans politically left and usually has a western perspective. Often has poor coverage of youtubers, flash games, meme culture, foreign authors, and politics of countries that do not speak english. Information is frequently updated. |
| Encyclopedia Britannica | Contains less information than wikipedia, and is not as frequently updated. Articles are written by top academics for impressive accuracy and balance. |
| Encyclopedia.com | Articles from over 200 physical reference works of great quality. Poor coverage of events and developments in the last 20 years. |
| Rationalwiki | Decidedly left wing encyclopedia with a focus on media and internet culture in the United States and the anglosphere. Over 7000 articles. |
| TV Tropes | Contains thousands of tropes and works. |
| Know Your Meme | 20'000 articles about meme culture. |