It can index a few million URLs and search for words and phrases, use wildcards, and do a Boolean search. Search results can be limited to time period given, site or Web space (set of sites) and sorted by relevance (Page rank is used) or date.

ASPseek is optimized for multiple sites (threaded index, async DNS lookups, grouping results by site, Web spaces). ASPseek can work with multiple languages/encodings at once and keep it compact due to UTF8 storage mode.

ASPseek is written in C++ using the STL library, and uses mix of SQL database and binary files for storage. [ASPSeek Manual]

This is pretty stable version tested on our website.
Download (CentOS5 / RedHat EL5 X86 RPMS):
aspseek-1.2.15-1.i386.rpm
aspseek-cgi-1.2.15-1.i386.rpm
aspseek-client-1.2.15-1.i386.rpm
aspseek-mysql-lib-1.2.15-1.i386.rpm
ASPSeek RPM Guide
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aspseek-1.2.15.tar.gz (sources)

ASPSeek – fulltext search engine, can handle 10.000.000 documents with response <1s
2 Servers with dual CPU/4GB RAM are recommended,
but you can index small number of pages up to 1.000.000 on one old P3/1GB RAM.