Ontop is a platform to query relational databases as Virtual RDF Graphs using SPARQL. It's fast and is packed with features.
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Guohui Xiao
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README.md

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Ontop

Ontop is a framework for ontology based data access (OBDA). It supports SPARQL over virtual RDF graphs defined through mappings to RDBMS.

Compiling, packing, testing, etc.

The project is a Maven project. Compiling, running the unit tests, building the release binaries all can be done using maven. Currently we use Maven 3 and Java 8 to build the project.

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License

The -ontop- framework is available under the Apache License, Version 2.0

  Copyright (C) 2009 - 2018 Free University of Bozen-Bolzano

  Licensed under the Apache License, Version 2.0 (the "License");
  you may not use this file except in compliance with the License.
  You may obtain a copy of the License at

      http://www.apache.org/licenses/LICENSE-2.0

  Unless required by applicable law or agreed to in writing, software
  distributed under the License is distributed on an "AS IS" BASIS,
  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  See the License for the specific language governing permissions and
  limitations under the License.

All documentation is licensed under the Creative Commons (attribute) license.