MetricsGraphics.js is a library built on top of D3 that is optimized for visualizing and laying out time-series data.

Open source graph database from Google

Open source project that aims at developing a recommendation framework based on graph data sources

Useful now that Google are retiring their sparkline API

Another graphing tool for visualising time series data. Built with MongoDB and Node.js

A visualisation and exploration platform for all kinds of networks and graphs: make pretty pictures from your node/edge databases.

Javascript library for charting with effects and interactivity

Another clever Canvas/Javascript toolkit for charts and things

AS library for data visualisation in Flash

RRDTool/Ganglia for analysis at Flickr. Counts to a log over UDP.

Everybody loves Sparklines

Prototype/Canvas powered charts

“Munin the monitoring tool surveys all your computers and remembers what it saw. It presents all the information in graphs through a web interface.”

Dynamic Javascript plotting library using jQuery

Ruby API for Google’s charts