Reactive Search - UI components for building Amazon / Yelp like Search
OpenGrok - OpenGrok is a fast and usable source code search and cross reference engine.
Searchkit - UI components for Elasticsearch
GrepCode - GrepCode.com is a code search engine built by developers for developers to search and browse open...
Searchbase - Build Search UIs with drag and drop
Krugle - Krugle is the complete enterprise solution for search targeted to the development organization.