Free Software for Java
Socket.io
Socket.IO is a free and open-source JavaScript library that can be used for building realtime web applications. The library consists of two parts, a server-side library for Node.js and a client-side library that runs in the browser.
Apache Chemistry
Apache Chemistry provides open source implementations of the Content Management Interoperability Services (CMIS) specification. Libraries are available for Java, Python, PHP and .NET.
Introduction to Ecommerce Software Development
The term eCommerce was coined in 1972 and it has slowly gained popularity as a buzzword since then. Today, we understand it as an umbrella term that covers all online buying and selling, including everything from selling physical products to providing digital services.