AntConc is free concordance software. It is multi-platform and easy to deploy and use.

AntConc is part of a suite of related tools for text processing and analysis, including applications for parallel corpus analysis, word profiling, PDF to text conversion, text structure analysis, detecting and converting character encodings, Japanese and Chinese segmenter and tokenizer, wordclass tagger, and spelling variant anaysis. The developer is currently drafting a more explicit licence for the use of the software.