PowerShell Pipeworks is a Framework for making Sites and Services with Windows PowerShell. It is designed to do for web development what PowerShell has done for IT development -- make it easy to build complex solutions out of simple parts.
There are a few server-side frameworks rising within Dart at this moment, but Angel has a different goal than all the rest. Angel aims to be a server-side framework optimized for full-stack development.
AmplifyJS is a set of components designed to solve common web application problems with a simplistic API. Amplify's goal is to simplify all forms of data handling by providing a unified API for various data sources.