Is there any tool that can index my site and external sites that are linked to from my site and build a search engine? I tried search engine composer but it didn't work, any other tool?
I've used Microsoft's Indexing Service - which just scans/indexes all files in a defined folder. Then you can just hit the query like a SQL query. Also I would advise setting a full-text index on your SQL DB. (This is for MS Server that is)