I am working on Angular 2 Project. Here I am confused, how those CLI, Seed & Ionic related to Angular. Those are developed in the Angular platform.
CLI, Seed & Ionic are sub-frameworks of Angular???
Angular CLI is a command line interface to scaffold and build angular apps using nodejs style (commonJs) modules. Not only it provides you scalable project structure, instead it handles all common tedious tasks for you out of the box. Angular CLI create Angular Apps
Angular Seed project is an application skeleton for a typical AngularJS (Not for Angular, Angular CLI is for Angular Apps) web app. You can use it to quickly bootstrap your angularjs webapp projects and dev environment for these projects. Angular Seed is an angularjs application.
Ionic Framework is an ultimate open source software development kit (SDK), used for developing hybrid mobile applications with JavaScript (angularjs & Angular rigth now), CSS and HTML5. Ionic mainly focused on the look, feel and UI interactions of an app. Ionic use Angular for building mobiles apps.
Hope I help!