SnappingGecko is a free Grasshopper plugin which provides object snapping features, helping you to keep your definitions clean.

Extended Help In Grasshopper.

Provide two additional wire type called line wire type, polyline wire type and electric wire type.

Shows dashboards live in the Rhino viewport based on inputs from Grasshopper. You can connect geometry, colors and data with mouse over previews and more. By LINK Arkitektur

Free Grasshopper plugin for naval architecture and marine industry.

Grasshopper Tool to warn of big internalized data in GH documents.

Swiftlet is a tool that lets you make web requests directly from Grasshopper

GH Python Remote is a special component that lets you use regular Python code directly in the GHPython component, like importing Numpy and Scipy.