ExpressJS - Sinatra inspired web development framework for node.js -- insanely fast, flexible, and simple
Cozy - Choose simplicity, get Cozy.
Chart.js - Easy, object oriented client side graphs for designers and developers.
HeyLandlord - Simplifying communication between landlords and tenants
Famous Engine - The Famous Engine is a free and open source JavaScript rendering engine.
Innago - Innago offers a cloud-based property management platform for landlords with small to midsize property portfolios. Innago is 100% free to use and comes with a long list of affordable features.