ZGraph

ZGraph is a cross-language graph visualization library designed for creating, manipulating, and rendering large graphs. It emphasizes scalable layouts and interactive exploration, supporting a range of domains from social networks to biological pathways.

The core data model represents graphs as sets of nodes and edges, with optional attributes for properties such as labels, weights, and types. It supports directed and undirected graphs, multi-edges, and simple subgraphs. Importers can read GraphML, JSON, and CSV mappings, while exporters can emit standard formats for interoperability.

Layout and rendering: ZGraph implements multiple layout algorithms including force-directed, hierarchical, circular, and geographic layouts. Rendering backends target SVG, Canvas, and WebGL, enabling smooth panning and zooming for large graphs. Annotations, tooltips, and selection states facilitate exploration.

Extensibility and ecosystem: A plugin system allows custom node/edge styles, new layouts, and data adapters. Language bindings exist for JavaScript, Python, and Java, making it usable in web apps and data science pipelines. It is distributed under an open-source license and maintained by a community of contributors.

Applications and reception: Used in education and research to visualize networks, assess connectivity, and illustrate graph algorithms. In practice, ZGraph competes with other visualization libraries by offering an emphasis on layout quality and interactivity.