Noic (2016)
Noic was founded in 2013 with the goal to promote scientific olympiads and democratize access to them. Its website has an olympic journal, study guides, and problem sets to a lot of national and international olympiads. The website has almost 2 million accesses and has always been completely run by students.
I joined Noic in 2015, and I started the initiative of writing a course for informatics olympiads from zero. At that time, there was little online material teaching competitive programming in Portuguese, and the course quickly became a widespread source for students who wanted to learn to code for the olympiad.
From 2016 to 2017 I was the director of the project and took the initiative further, finding contributors from other areas to create courses in other disciplines.