RoR dev having trouble with finding best-packages for Django

Hi, I have done web development with Ruby on Rails and now I'm learning to use Django for a web application, where I facing some issues finding the best libraries/ packages available.

What are the best packages/apps in Django available for the following:

1. User authentication - Rails offers Devise which provides all authentication out-of-the-box, such as sign up/ sign-in/ forgot password emails / sending activation emails / web-http authentication etc. What's the best one for Django?

2. User authorization - Rails offers Cancan, where using a simple declarative syntax, you can assign read/modify permissions to various methods for administrators/ users etc. What's the best one for Django?

3. Facebook sign-up - I found django-facebook and python-social-auth as the 2 major packages out there, but I'm not sure which one is the better? Is there any other better package out there that I couldn't find? Or which one of the 2 is better?

4. Listing of all available & best packages - I searched through the available packages listing, but they are not ordered based on # of active users or most popular package etc. So, I have to sift through all of them. Does Django have a listing similar to ruby-toolbox for Ruby & Rails packages?

5. Django and Python version - Should I use Python 3 or Python 2 would be fine? Better question - Should I use Django 1.7 or latest version 1.7.5? Are the changes in the latest version considerable enough to start using 1.7.5?

Thanks.

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