Wmatrix is a free tool for corpus analysis and comparison. It provides a web interface for USAS and CLAWS, in addition to enabling standard corpus linguistic functions such as frequency lists and concordances.

Voyant Tools is a web-based reading and analysis environment for digital texts.

CorpusSearch 2 allows users to construct and search syntactically annotated corpora, including finding and counting lexical and syntactic patterns, correcting systemic errors, and coding linguistic features.

The software is released under Mozilla Public License 1.1 (MPL 1.1) .