Paxle is a full-fledged, modular search framework based on OSGi.
All functional modules are strictly separated and can therefore be exchanged independently. It provides meta search capabilities via definition of several search-providers.
In addition to these external resources, Paxle crawls the web and efficiently stores the content in a local database, which is part of Paxle but can be exchanged just as well.
A search-provider for this DB is also included.
Paxle's licence is little restrictive and it is Open Source Software as defined by OSI and FSF.
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