"a self-hosted, lightweight web application and server monitoring toolkit. It provides you with straightforward visualisation of essential server data. It helps you manage the errors that occur in your web applications and makes logging complex datastructures and searching in your log data easy"

"an open-source system for visualizing time series data, built on MongoDB, Node and D3"

"High performance, high class web development for Node.js". Basically Sinatra for Node.