World's top universities are continuously offering free courses to students worldwide, irrespective of their Geographical location, and affordability. Visit https://www.coursera.org to search by categories or for all courses click : https://www.coursera.org/courses . Some of the courses are as following.
6 weeks long
Cryptography II
Dan Boneh, Professor
Stanford University
8 weeks long
Data Analysis
Jeff Leek
Johns Hopkins University
12 weeks long
Introductory Human Physiology
Emma Jakoi, Jennifer Carbrey
Duke University
5 weeks long
Artificial Intelligence Planning
Gerhard Wickler, Austin Tate
University of Edinburgh
Learn to Program: The Fundamentals
Jennifer Campbell, Paul Gries
University of Toronto
7 weeks long
Mathematical Biostatistics Boot Camp
Brian Caffo
Johns Hopkins University
Organizational Analysis
Daniel A. McFarland
Stanford University
11 weeks long
Probabilistic Graphical Models
Daphne Koller, Professor
Stanford University
8 weeks long
Social Network Analysis
Lada Adamic
University of Michigan
10 weeks long
Computer Architecture
David Wentzlaff
Princeton University
6 weeks long
Algorithms: Design and Analysis, Part 2
Tim Roughgarden, Associate Professor
Stanford University