COSCUP 2013 was a 2-day Taiwanese conference held at the Taipei International Conference Centre with over 1,500 participants across 8 tracks in Mandarin and English. It featured keynote speeches from Greg Kroah-Hartman, the Linux kernel maintainer, and other speakers from Taiwan, Europe, America, Japan, Hong Kong, and China across communities like Drupal, JavaScript, Mozilla, Python, R, and more. Registration for open source contributors before May 31st sold out within 30 minutes.