E-Konkursy.info is probably the best Polish site about this topic. Daily published dozens of new contests. With a friendly atmosphere on the forum you can count on the help of others. Check out what's going to win!
The International Collegiate Programming Contest is an algorithmic programming contest for college students. Teams of three, representing their university, work to solve the most real-world problems, fostering collaboration, creativity, innovation, and the ability to perform under pressure. Through training and competition, teams challenge each other to raise the bar on the possible. Quite simply, it is the oldest, largest, and most prestigious programming contest in the world.
Babes of London