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- de:Indogermanische Ursprache
- en:Proto-Indo-European language
- eo:Hindeŭropa pralingvo
- es:Idioma proto-indoeuropeo
- fr:Indo-européen commun
- it:Indoeuropeo
- la:Lingua Protoindoeuropaea
- pt:Proto-indo-europeu
- simple:Proto-Indo-European language
- Top Languages ("TOP LANGUAGES: The World's 10 most influential Languages" by George Weber)
- Free Dictionaries project
- Bilingual and Trilingual Biomedical-Technical Dictionary/Thesaurus in Portuguese, English, Spanish, French and/or Dutch
- Links to 2,100 Medical and Biomedical Glossaries & Dictionaries online in 23 languages
- Pivot language
- Majstro Aplikaĵoj
- Multitran
- словарь Мультитран
- Jennifer's language page
- Cucumis.org (free online translation service)
- Deborah Tannen (American professor of linguistics)
- Text analysis, wordcount, keyword density analyzer, prominence analysis
- Free Online Word Count Tool and Online Character Count Calculator
- Brahmic family of scripts
- Indian alphabet comparison page (Hindi, Punjabi, Bengali, and Gujarati)
- SignWriting
- SignWriting: Read & Write Sign Languages
- SignBank SignPuddle: Sign Language Software in SignWriting
- World Star Free Dictionaries Translators Encyclopedias (keyboards in 47 languages [2 for Chinese] at bottom of page)
- Online Talking Dictionary (keyboards in 10 languages [2 for Turkish])
- Alexander Arguelles (scholar of foreign languages)
- Foreign Language Expertise - The Website of Alexander Arguelles
- EuroWordNet
- EuroWordNet:Building a multilingual database with wordnets for several European languages.
- Europe etymology maps 1 - Imgur [bear (animal); church; beer (drink); rose; ananas; apple; tea; cucumber; orange]
- The Geography of the “Onion” Vocabulary - Languages Of The World
- MultiTree ("A Digital Library of Language Relationships")
- Glottolog 2.1 ("Comprehensive reference information for the world's languages, especially the lesser known languages.")
- OLAC (Open Language Archives Community)