samyama-graph: Samyama is a graph-vector database written in Rust. It supports OpenCypher queries, Redis protocol, vector search, and graph algorithms. It can handle billions of edges on a single machine.; ontosphere: Ontosphere is a browser-based RDF/ontology knowledge graph editor that loads RDF from files, URLs, or SPARQL endpoints, allows users to author nodes and edges on a canvas, runs OWL 2 DL reasoning with visual differentiation of inferred triples, and supports multi-algorithm layout and AI-agent integration via the Model Context Protocol.
Biomedical knowledge graphs (PubMed, ClinicalTrials.gov, etc.)
Building and maintaining knowledge graphs