RxJS stands for Reactive Extensions for JavaScript, which is a the javascript implementation of ReactiveX API. It brings the concept of "reactive programming" to the JavaScript applications for composing asynchronous and event-based programs by using observable sequences.
Git is a leading, free, open source, distributed, most powerful and most commonly used version control system (VCS), which is designed by Linus Torvalds for tracking changes in source code during software development. It is mainly design for coordinating work among programmers to handle everything from small to very large projects with speed and efficiency.
Nx stands for Narwhal extension for Angular. It is not a replacement of angular Cli, it is just an extension for the Angular CLI implementing monorepo-style development. It is an open source toolkit created by Ex googlers at company called Narwhal for enterprise or large Angular applications. It is also a collection of runtime libraries, linters, and code generators helping large teams build better with Angular.
