Unix-based file indexing and searching engine based on SWISH-E. SWISH++ is a complete rewrite developed to circumvent difficulties with the SWISH-E package.

The ht://Dig system is a complete WWW indexing and searching system for a domain or intranet.

mnoGoSearch (former UDMSearch): is an open source Search Engine. more detail is needed, if you know anything about mngosearch please edit and describe it

SWISH-E is a fast, powerful, flexible, free, and easy to use system for indexing collections of Web pages or other files.