What Angular 4 Open Source projects can be taken as an example to increase the level of the code?

Question

Angular

I participate in the development of a fairly large project on the 4th Angular. Periodically, questions arise "how best to do" this or that thing. Most often with regards to forms, but not the essence.
The question is simple: advise Angular 2 / 4 / 5 Open Source projects whose code can be taken as an example.
I looked through a lot of top 5 / 10 / 15 best angular projects from Google - they are all rather small, and (including angular material) do not provide answers to questions that arise. The project should be with a lot of functionality, logic, Reactive Forms, filtering.
PS Attention! - general materials about the approach to programming, for example: these and these and even thesedon't offer! :) We are already actively studying them, reading and re-reading them. What you need is specific: Examples of Angular 4 Open Source projects with great functionality and good code from which to take an example.

Answer 1

Сlarity , primeng in general, take a look at the resources

Answer 2

https://github.com/akveo/blur-admin mb will do

Answer 3

source code of angular.io