Django Apps

Google Waller:
http://django-payments.readthedocs.org/en/latest/modules.html#google-wallet
http://django-payments.readthedocs.org/en/latest/usage.html

Django Social Auth:
https://github.com/omab/django-social-auth

Django Social Registration:
https://github.com/flashingpumpkin/django-socialregistration

Sending Email:
https://docs.djangoproject.com/en/dev/topics/email/

Ajax Form Submission:
http://www.micahcarrick.com/ajax-form-submission-django.html

Dynamic Formset:
https://github.com/elo80ka/django-dynamic-formset/tree/master/demo/example

Django Forms Utils:
https://bitbucket.org/carljm/django-form-utils/src

Libav Video Conversion Replaces FFMPEG:
http://libav.org/documentation.html
http://roxlu.com/2014/039/decoding-h264-and-yuv420p-playback
http://roxlu.com/2013/002/converting-video-audio-using-avconv
http://en.flossmanuals.net/ogg-theora/command-line-editing/analysing-ogg/

http://www.xiph.org/oggz/

Gifsicle:
http://www.lcdf.org/gifsicle/
http://nullprogram.com/blog/2012/04/10/
http://www.lcdf.org/gifsicle/man.html

Django Packages:
https://www.djangopackages.com

Django Cart:  Super Simple Cart System:  You will have to develop it further.  Great start for custom solutions.
https://code.google.com/p/django-cart/

Django Shop Area Tax:
https://github.com/Lacrymology/django-shop-area-tax

Language Pack For Django Shop Area Tax 
https://github.com/Lacrymology/django-shop-l10n

Django Email Registration:
https://github.com/matthiask/django-email-registration
https://github.com/bitmazk/django-registration-email