This is a simple but efficient Recommender System in Python using collaborative filter. It uses Pearson Correlation Coefficients to recommend movies. It can also be used for other purposes.
I developed it because I was tired of getting recommendations of movies I had already watched, so I built my own system. I have also a version on Kaggle using different data at: https://www.kaggle.com/flaviobossolan/simple-efficient-movie-recommender/