University of Freiburg: Algorithms and Data Structures Group

Code from our various research projects and publications

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Freiburg im Breisgau, Germany
https://ad.informatik.uni-freiburg.de/front-page-en?set_language=en
bast@informatik.uni-freiburg.de

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qleverqleverPublic
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++ 595 82
aqquaqquPublic
More Accurate Question Answering on Freebase
Python 107 36
completesearchcompletesearchPublic
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++ 24 6
pfaedlepfaedlePublic
Precise map-matching for public transit feeds. Generates high-quality GTFS shapes from OSM data.
C++ 240 32
large-qa-datasetslarge-qa-datasetsPublic
A collection of large question answering datasets
396 39
pdfactpdfactPublic
A basic tool that extracts the structure from the PDF files of scientific articles.
Java 74 11

Repositories

Showing 10 of 67 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++ 595Apache-2.0 82 134 74 UpdatedJul 7, 2025
osm-live-updates Public
Update SPARQL endpoints with OpenStreetMap data (converted via osm2rdf) by processing OsmChange files
ad-freiburg/osm-live-updates’s past year of commit activity
C++0GPL-3.0 1 0 0 UpdatedJul 7, 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++ 28GPL-3.0 8 11 8 UpdatedJul 3, 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++ 40 0 2 UpdatedJun 27, 2025
util Public
Small library of utility functions
ad-freiburg/util’s past year of commit activity
C++00 0 0 UpdatedJun 27, 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 2 4 6 0 UpdatedJun 20, 2025
qlever-control Public
ad-freiburg/qlever-control’s past year of commit activity
Python 48Apache-2.0 22 39 17 UpdatedJun 19, 2025
ad-blog Public
AD Blog Posts (currently: student project reports)
ad-freiburg/ad-blog’s past year of commit activity
HTML0 39 1 5 UpdatedMay 30, 2025
sparqloscope Public
Sparqloscope: A generic benchmark for the comprehensive and concise performance evaluation of SPARQL engines
ad-freiburg/sparqloscope’s past year of commit activity
Python 2Apache-2.00 0 2 UpdatedMay 30, 2025
qlever-ui Public
A user interface for QLever
ad-freiburg/qlever-ui’s past year of commit activity
JavaScript 38Apache-2.0 18 43 (1 issue needs help) 8 UpdatedMay 23, 2025