Astronomy
- Adventures in Deep Space: Challenging Observing Projects for Amateur Astronomers
- American Association of Variable Star Observers
- Artsnova
- AstroArts – アストロアーツ
- Astrometry.net
- Astronomy Forums
- Astronomy Now
- Asymptote Journal
- Blue Marble Navigator
- Clear Dark Sky
- Cloudy Nights
- Company Seven
- Eclipse Chasers
- GLIMPSE360: Spitzer's Infrared Milky Way
- Glossary of Astronomical Terminals
- GRIN
- Heavens Above
- Home « Department of Astronomy, College of LAS, University of Illinois
- Hubble Site
- IMO
- International Comet Quarterly
- Jeff Russell's STARSHIP DIMENSIONS
- John Goglia's Safe Skies
- LSST
- McDonald Observatory
- Royal Museums Greenwich
- Sky&Telescope
- SkyMap astronomy software
- Solar System Scope
- Southern Stars
- Space and NASA News – Universe and Deep Space Information | Space.com
- StarDate Online
- Stargazers Lounge
- Telescope Reviews | Cloudy Nights
- Terrastro
- The Universe
- The World at Night
- Universe Today
Bibliography
IT
Library
- Archive.org
- Asiaing.com
- Bartleby
- BlackMask
- Canvas Network
- Classical Authors Index
- Coursera
- edX
- Gallica
- Literature
- Making of America Books
- Marxist
- McMaster University Archive for the History of Economic Thought
- Online Library of Liberty
- Perseus Digital Library
- Posner Memorial Collection
- UC Press E-books Collection
- Udacity
- University of Virginia Library
- Venture Lab
- World Cat
- World Digital Library
- 我有閒
Linguistics
- CCL語料庫
- CNKIDictrionary
- Digital Etymological Dictionary of Old Chinese
- Ed Donnelly
- EPHEMERIS. Nuntii Latini universi.
- introduction of Praat
- IPA
- Lang-8
- Learn Greek and Latin
- Online Etymology Dictionary
- Praat
- Praat: doing Phenetics by Computer
- Test Your Vocabulary
- Unihan Database
- Wheelock's Latin
- Word Reference
- 上古音查詢
- 中國語言文字網
- 北京大學中國語言學研究中心
- 北大中文論壇
- 國家語言資源監測與研究中心
- 國際電腦漢字與異體字知識庫
- 國際電腦漢字與異體字知識庫
- 常用國字標准字體筆順學習網
- 搜狗實驗室資料下載
- 東方語言學
- 漢語方言網頁
- 漢語詞類、語法結構測試系統
- 與研學論壇
- 語言文字學書目2297種
- 語言文字網
- 說文解字注