A free semantically annotated corpus that anyone can edit!
The Groningen Meaning Bank (GMB), developed at the University of Groningen, comprises thousands of texts in raw and tokenised format, tags for part of speech, named entities and lexical categories, and discourse representation structures compatible with first-order logic. The current (development) version of the GMB is accessible via the GMB Explorer. A multi-lingual continuation of the GMB is the Parallel Meaning Bank.
You're welcome to contribute to the GMB by providing corrections to existing linguistic annotations in a wiki-like environment. Anyone can register via the GMB Explorer and check, improve, or discuss linguistic annotations. Stable releases are available from the data page.