An open distributed search engine for science
Warning! Alpha software! May not work at all.
Scholar Ninja is, in its essence, an entirely distributed search engine for science. What makes Scholar Ninja unique is that all of its functions (indexing, searching, and distributed server) are contained within a browser extension.
Scholar Ninja is a free & open source project.
A bit more background about this project can be found here: http://juretriglav.si/an-open-distributed-search-engine-for-science/
Update: Now comes packed with simplified software discovery for researchers: http://juretriglav.si/discovery-of-scientific-software