Kirby PHP CMS
Coming from games and programming in C#, Java and C++, the web and its languages were totally new to me until recently (i.e. a year or so). Luckily, my friend Bastian gave me the opportunity to work with him and learn from him. In the process I contributed some minor backend stuff to his PHP CMS, Kirby. If you don't know it check it out, it's awesome, this website is made with it (as well as the greater part of my other websites).