CMIYC 2021 just finished!

Past contests include:

The 2020 contest.
The 2019 contest.
The 2018 DerbyCon contest.
The 2018 DEF CON contest.
The 2017 DerbyCon contest.
The 2015 contest.
The 2014 contest.
The 2013 contest.
The 2012 contest.
The 2011 contest.
The 2010 contest.