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@ad-freiburg

University of Freiburg: Algorithms and Data Structures Group

Code from our various research projects and publications

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  1. qlever qlever Public

    Very fast SPARQL Engine, which can handle very large knowledge graphs like the complete Wikidata, offers context-sensitive autocompletion for SPARQL queries, and allows combination with text search…

    C++ 483 61

  2. aqqu aqqu Public

    More Accurate Question Answering on Freebase

    Python 107 36

  3. completesearch completesearch Public

    Search engine for semi-structured data (text and structured data) that provides all kinds of intelligent search features (keyword search, autocompletion, faceted search, error-tolerant search, syno…

    C++ 20 5

  4. pfaedle pfaedle Public

    Precise map-matching for public transit feeds. Generates high-quality GTFS shapes from OSM data.

    C++ 218 30

  5. large-qa-datasets large-qa-datasets Public

    A collection of large question answering datasets

    358 37

  6. pdfact pdfact Public

    A basic tool that extracts the structure from the PDF files of scientific articles.

    Java 74 11

Repositories

Showing 10 of 64 repositories
  • qlever Public

    Very fast SPARQL Engine, which can handle very large knowledge graphs like the complete Wikidata, offers context-sensitive autocompletion for SPARQL queries, and allows combination with text search. It's faster than engines like Blazegraph or Virtuoso, especially for queries involving large result sets.

    ad-freiburg/qlever’s past year of commit activity
    C++ 483 Apache-2.0 61 108 50 Updated Feb 14, 2025
  • osm2rdf Public

    Convert OpenStreetMap (OSM) data to RDF Turtle, including the object geometries and predicates ogc:sfContains, ogc:sfCovers, ogc:sfIntersects, ogc:sfTouches, ogc:sfCrosses, ogc:sfEquals, and ogc:sfOverlaps. Weekly updated downloads for the whole planet (~ 80 billion triples) and per country.

    ad-freiburg/osm2rdf’s past year of commit activity
    C++ 24 GPL-3.0 8 10 6 Updated Feb 14, 2025
  • spatialjoin Public

    Compute spatial self-joins (on intersects, contains, covers, touches, crosses, overlaps, equals) on large collections of WKT geometries. Can handle the complete OSM data as input.

    ad-freiburg/spatialjoin’s past year of commit activity
    C++ 3 0 0 2 Updated Feb 14, 2025
  • qlever-control Public
    ad-freiburg/qlever-control’s past year of commit activity
    Python 38 Apache-2.0 18 26 9 Updated Feb 13, 2025
  • qlever-ui Public

    A user interface for QLever

    ad-freiburg/qlever-ui’s past year of commit activity
    JavaScript 28 Apache-2.0 17 36 (1 issue needs help) 9 Updated Feb 13, 2025
  • loom Public

    Software suite for the automated generation of geographically correct or schematic transit maps.

    ad-freiburg/loom’s past year of commit activity
    C++ 161 GPL-3.0 17 10 0 Updated Feb 13, 2025
  • pfaedle Public

    Precise map-matching for public transit feeds. Generates high-quality GTFS shapes from OSM data.

    ad-freiburg/pfaedle’s past year of commit activity
    C++ 218 GPL-3.0 30 10 2 Updated Feb 3, 2025
  • ad-blog Public

    AD Blog Posts (currently: student project reports)

    ad-freiburg/ad-blog’s past year of commit activity
    HTML 0 33 1 4 Updated Feb 3, 2025
  • natural-entity-types Public

    Methods for determining the most natural type of a Wikidata entity

    ad-freiburg/natural-entity-types’s past year of commit activity
    Python 1 0 0 0 Updated Jan 31, 2025
  • sparql-conformance Public

    SPARQL test suite (https://www.w3.org/2009/sparql/docs/tests/) for QLEVER (https://github.com/ad-freiburg/qlever)

    ad-freiburg/sparql-conformance’s past year of commit activity
    Python 1 1 1 0 Updated Jan 30, 2025
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