TalkBank

Link: http://talkbank.org/

Intro: The goal of TalkBank is to foster fundamental research in the study of human and animal communication. It will construct sample databases within each of the subfields studying communication. It will use these databases to advance the development of standards and tools for creating, sharing, searching, and commenting upon primary materials via networked computers.

The interactive Grammar of English (iGE)

Excellent app for iPhone, iPad, iPod Touch. A must-buy app.

Apple link.

Automated Grammatical Error Detection for Language Learners

See this online link.
See the review from Computational Linguistics Journal.