ACL Anthology (A Digital Archive of Research Papers in Computational Linguistics)

AfBo: A world-wide survey of affix borrowing

ANNUAL REVIEW OF LINGUISTICS

AUTOTYP

British National Corpus

CLLD – Cross-Linguistic Linked Data

CHILDES - Child Language Data Exchange System - CMU

Chinese Character Frequency Statistics for Hong Kong, Mainland China and Taiwan - A Trans-Regional, Diachronic Survey

Concordance, text analysis and concordancing software, is for anyone who needs to study texts closely or analyse language in depth.

Corpus Concordance English

Corpus of Contemporary American English

Digital Librarian- Languages

Diversity Linguistics Comment

eWAVE (the electronic World Atlas of Varieties of English) 

Glottolog

Glottopedia, the free encyclopedia of linguistics.

Glossary of linguistic terms

Grammatical Features

Humans who read grammars

Indo-European Online

LanGeLin (Language and Gene Lineages) 

Language Landscape

Leeds - A collection of Chinese corpora

Ling Alert

Linguistic Data Consortium

International Linguistics Olympiad

OLAC: Open Language Archives Community

PARADISEC (The Pacific and Regional Archive for Digital Sources in Endangered Cultures)

Proceedings from Cascadilla Proceedings Project

Santa Barbara Corpus of Spoken American English

Syntactic Structures of the World's Languages

THE CHINESE PEAR STORIES

THE UNIVERSALS ARCHIVE

The World Atlas of Language Structures (WALS)

UCL Survey of English Usage

Weak referentiality