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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++ 916 145

  2. aqqu aqqu Public

    More Accurate Question Answering on Freebase

    Python 107 35

  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++ 29 9

  4. pfaedle pfaedle Public

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

    C++ 294 40

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

    A collection of large question answering datasets

    441 45

  6. pdfact pdfact Public

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

    Java 77 11

Repositories

Showing 10 of 76 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++ 916 Apache-2.0 145 243 202 Updated Oct 10, 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++ 7 Apache-2.0 4 1 1 Updated Oct 9, 2026
  • util Public

    Small library of utility functions

    ad-freiburg/util's past year of commit activity
    C++ 1 Apache-2.0 4 0 5 Updated Oct 9, 2026
  • grasp Public

    GRASP: Generic Reasoning and SPARQL generation across Knowledge Graphs

    ad-freiburg/grasp's past year of commit activity
    Python 26 Apache-2.0 14 0 4 Updated Oct 5, 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++ 45 GPL-3.0 11 7 5 Updated Oct 5, 2026
  • ad-blog Public

    AD Blog Posts (currently: student project reports)

    ad-freiburg/ad-blog's past year of commit activity
    HTML 0 51 1 14 Updated Sep 30, 2026
  • qlever-petrimaps Public

    Interactive visualization of SPARQL query results with geospatial information on a map, either as individual objects or as a heatmap.

    ad-freiburg/qlever-petrimaps's past year of commit activity
    C++ 21 Apache-2.0 8 5 4 Updated Sep 29, 2026
  • ad-freiburg/wiki-entity-linker's past year of commit activity
    JavaScript 4 Apache-2.0 0 0 0 Updated Sep 5, 2026
  • wikidata-query-logs Public

    Dataset of Question-SPARQL-pairs over Wikidata built from SPARQL query logs

    ad-freiburg/wikidata-query-logs's past year of commit activity
    Python 7 Apache-2.0 0 1 0 Updated Sep 4, 2026
  • scholia Public Forked from WDscholia/scholia

    Wikidata-based scholarly profiles

    ad-freiburg/scholia's past year of commit activity
    JavaScript 3 GPL-3.0 102 23 1 Updated Aug 6, 2026