What are extensible project management systems?

Question

CRM

Good afternoon.
I would like to choose an online project management system that satisfies several of the following criteria:
1) The system developers provide the source code
2) It is possible to modify using modules/components/plugins
3) There are ready-made solutions in the form of modules/components/plugins
3) Modern interface
4) Large (or developing community)
5) Flexible elements of the system (custom fields, form designer)
An example of what I would like to give is CRM Zurmo - its core is the Yii framework, it has a form designer, there is a small Russian community, REST API . More Asana

Answer 1

> Modern interface is a
very loose concept of
Redmine for example. However, I'm not sure about the form designer.

Answer 2

Zurmo and Asana are different things. Asana doesn't have the source code, and doesn't have much of what you want. But if you like Asana, then look towards Trello , Basecamp and Megaplan ( old and new ).

Answer 3

Podio.com again.