The IMS Corpus Workbench is a software suite for encoding and querying large text corpora (up to 300 million tokens). CQP, the corpus query processor, allows for fast and flexible searching. All tools in the suite are command line tools running on the Solaris or Linux operating system.
TLA-team: Full featured toolset for interactively working with corpora. Support for comparitive queries, frequency analisys, etc.