This module helps to cast environment variables to desired types. It may be very useful for 12factor app usage.
Fast and modern meta tags parser (og, twitter, title, description, etc) with snippet support
Various sorting algorithms in pure python
Html minification middleware with (but not only) django support and good
Basic metro models for Django 1.7+, plus the parser that fills models with actual data (lines numbers, lines titles, lines colors, the names of the lines, the station names) from various data sources (primary - Wikipedia).