Technologies

About Python
Python is a programming language that lets you work more quickly and integrate your systems more effectively ... http://python.org/

About Django
Django is a high-level Python Web framework that encourages rapid development and clean, pragmatic design ... https://www.djangoproject.com/

About PostgreSQL
PostgreSQL is a powerful, open source object-relational database system. It has more than 15 years of active development and a proven architecture that has earned it a strong reputation for reliability, data integrity, and correctness ... http://www.postgresql.org/about/

About Ruby
Ruby is a language of careful balance. Yukihiro “matz” Matsumoto the creator has often said that he is “trying to make Ruby natural, not simple,” in a way that mirrors life ... http://www.ruby-lang.org/en/about/

About Rails
Rails is an open-source web framework that's optimized for programmer happines and sustainable productivity ... http://rubyonrails.org/

HTML and CSS

JavaScript and a number of AJAX libraries (such as jQuery)