From Seo Wiki - Search Engine Optimization and Programming Languages
It is aimed at any application involving full text search, and the project lies particular emphasis on its cross platform compatibility. Egothor has been successfully configured as a standalone application, in libraries or as peer-to-peer hub.
Egothor is able to recognize many common file formats: HTML, PDF, PS, DOC and XLS. Its architecture means that other file formats can be easily added. The engine can index about 50 pages a second and comes with a high capacity crawler robot which is compatible with the robots.txt standard.
Egothor supports both Boolean and vector search. Its open architecture can easily be extended and supports almost any language. The search engine is currently mostly used as a demo or in small scale projects.