The Maven License Verifier Plugin is a Maven plugin that is intended to check the licenses of artifacts managed by Maven. This can be done during the build process, you can choose to let the build fail if an artifact with a wrong license is used. The licenses are categorized by a definition file that lists them with their different URLs and names. This can be different from project to project.
jRapidRPC is a Java RPC library that allows you to create client-server applications that talk in objects. It is small, fast, and extensible. Its smallness helps you learn how to use the library quickly. jRapidRPC is fast due to its compact size and lack of complexity. Also, it uses the ProtoStuff serializer by default. jRapidRPC's extensibility allows you to can write a new client-server or a new serializer.
Duke is a fast and flexible record linkage engine. It does not use the traditional blocking (sort by key) approach, but instead relies on Lucene. This makes it high-performance (able to process 1,000,000 records in ~10 minutes). Duke can be run from the command line, but also has an API allowing incremental linking applications to be built easily. It supports reading data from CSV, JDBC, SPARQL, and NTriples, and also supports a number of string comparators and string normalizers.
Fuseki is a server that provides access to the SPARQL 1.1 standard. SPARQL is a W3C query language for RDF data on the Semantic Web. It forms a part of the Jena semantic web project. Fuseki provides the REST-style SPARQL HTTP Update, and SPARQL Query and SPARQL Update using the SPARQL protocol over HTTP. The SPARQL standards are works-in-progress by the SPARQL working group and while the general designs are stable, details may change. Fuseki will track the draft standards.