At Delft Ecological Design, we handcraft our interactive interfaces and simulation environments by coding them in C++, Java, and/or Python mixed with OpenGL. Although this may not be the easiest route to take, it gives us complete freedom to create the interfaces that operators need for their job. Over the years, we have built several software libraries, allowing us to quickly prototype displays and test them in human-in-the-loop experiments. Occasionally, we publish some of our software in the form of interactive demos on this website.