Instituto Cervantes
Science, Social Sciences, Linguistics, Languages - Instituto Cervantes. Internet based educational infrastructure set up to provide Spanish courses.
https://ave.cervantes.es/
Jergas De Habla Hispana - Spanish Slang
Science, Social Sciences, Linguistics, Languages - Jergas De Habla Hispana - Spanish Slang. Slang and colloquialisms from every Spanish-speaking country, including Spanglish.
http://www.jergasdehablahispana.org/
Javascript Redirect - Learn Spanish online
Science, Social Sciences, Linguistics, Languages - Spanish Verb Conjugation Trainer. A javascript tool to practice the present tense, preterite and subjunctive forms of the most important basic and irregular Spanish verbs, plus a list of links to more exercises on these topics.
https://www.spaleon.com/
Silver Mountain Software Home Page
Science, Social Sciences, Linguistics, Languages - Silver Mountain Software. Software for Classical and Koine Greek studies.
http://silvermnt.com/
TITUS
Science, Social Sciences, Linguistics, Languages - TITUS. Thesaurus of Indo-European Texts and related material.
http://titus.uni-frankfurt.de/
Learn Slovak
Science, Social Sciences, Linguistics, Languages - Learn Slovak. Offers online courses and lessons, a dictionary, overview of grammar, chat, and discussion.
http://www.learnslovak.com
Thesaurus Linguae Graecae
Science, Social Sciences, Linguistics, Languages - Thesaurus Linguae Graecae. Selling CD-ROMs containing digitised versions of all extant Greek texts from Homer to 600 AD.
https://www.tlg.uci.edu/
Perseus Digital Library
Science, Social Sciences, Linguistics, Languages - Perseus Project. Extensive website for classical Greek: texts, dictionaries, online grammar.
http://perseus.tufts.edu/