It is now being maintained by a research group at the University of Edinburgh. The Glimpse software was developed at the University of Arizona. The GlimpseHTTP software has now been replaced by WebGlimpse. This software is available for free. This software is available for free.
Muscat claims to have advanced linguistic inference technologies.
Isite includes the Isearch component. Try Them Interfaces to examples of each of the indexing packages is given below. They are listed in order of popularity. Feel free to try them. A default search term of web is given.