SemRepo is an RDF knowledge graph with over 81 million triples on nearly 200,000 GitHub repositories linked to scientific research. SemRepo captures fine-grained repository-level metadata (e.g., contributors, issues, programming languages) and interlinks this information with external scholarly knowledge graphs: repositories are connected to publications in LPWC, repository authors are linked to their profiles in SemOpenAlex, and research artifacts (e.g., datasets, experiments) are linked via MLSea.
What exactly do we provide?
- Periodically updated (approx. twice per year) RDF dump files of the SemRepo Knowledge Graph.
- A publicly accessible SPARQL endpoint containing the latest SemRepo Knowledge Graph data.
- Semantic interlinking of GitHub repositories with external scholarly knowledge graphs.
- An OWL ontology with 19 classes and 47 relations for modelling research-connected software repositories.
- Open-source pipeline for SemRepo construction and automatic interlinking, enabling future extensions of SemRepo.
- URI resolution of the SemRepo Knowledge Graph within the Linked Open Data Cloud.
How big is the SemRepo Knowledge Graph?
SemRepo.org contains (as of April 2026)*:
🗃️ Repositories: 197,566
🧑💻 Contributors: 2,916,508
🏷️ Issues: 2,609,510
🧠 Programming Language: 387,284
🏢 Organizations: 12,879
🧠 Packages: 95,505
🧵 Research Topics: 272,378
🧑🔬 Linked SemOpenAlex Authors: 11,867 (see https://semopenalex.org)
🔗 Linked LPWC Repositories: 197,566 (see https://linkedpaperswithcode.com)
🔗 MLSea Software entities: 148,185 (see https://w3id.org/mlsea)
*core classes only, in total SemRepo contains 19 classes.