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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

    Graph database implementing the RDF and SPARQL standards. Very fast and scales to more than a trillion triples on a single commodity machine

    C++ 735 107

  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++ 26 8

  4. pfaedle pfaedle Public

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

    C++ 263 36

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

    A collection of large question answering datasets

    429 46

  6. pdfact pdfact Public

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

    Java 76 11

Repositories

Showing 10 of 74 repositories
  • qlever Public

    Graph database implementing the RDF and SPARQL standards. Very fast and scales to more than a trillion triples on a single commodity machine

    ad-freiburg/qlever’s past year of commit activity
    C++ 735 Apache-2.0 107 184 99 Updated Jan 14, 2026
  • ortler Public

    Powerful and versatile command-line tool for managing OpenReview venues

    ad-freiburg/ortler’s past year of commit activity
    Python 1 Apache-2.0 0 0 0 Updated Jan 14, 2026
  • dicom2rdf Public

    Convert millions of DICOM SR documents to RDF Turtle using the embedded coded concepts.

    ad-freiburg/dicom2rdf’s past year of commit activity
    Rust 0 Apache-2.0 0 0 0 Updated Jan 13, 2026
  • scholia Public Forked from WDscholia/scholia

    Wikidata-based scholarly profiles

    ad-freiburg/scholia’s past year of commit activity
    JavaScript 2 GPL-3.0 91 19 1 Updated Jan 10, 2026
  • grasp Public

    GRASP: Generic Reasoning and SPARQL generation across Knowledge Graphs

    ad-freiburg/grasp’s past year of commit activity
    Python 12 Apache-2.0 4 0 0 Updated Jan 9, 2026
  • 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++ 263 GPL-3.0 36 9 2 Updated Jan 9, 2026
  • util Public

    Small library of utility functions

    ad-freiburg/util’s past year of commit activity
    C++ 0 1 0 0 Updated Jan 9, 2026
  • osm2rdf Public

    Convert OpenStreetMap (OSM) data to RDF Turtle, including the object geometries and all their DE-9IM spatial relations. Weekly updated dumps for the whole planet (~ 200 billion triples) and for each country.

    ad-freiburg/osm2rdf’s past year of commit activity
    C++ 36 GPL-3.0 9 7 6 Updated Jan 9, 2026
  • 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++ 5 2 0 2 Updated Jan 9, 2026
  • 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 2 4 6 0 Updated Dec 14, 2025
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