OKMaps - a visual interface to the world's scientific knowledge - follows the motto, "open science, all the way". The idea of OKMaps goes back to the Panton Principles for Open Data in Science, and with mentoring from the Open Leaders program. The base consists of knowledge maps, a powerful tool to explore a research field and increase the visibility of research findings for science and society alike. From OKMaps roadmap (an API is part of OKMaps roadmap) to OKMaps source code and OKMaps data, everything on OKMaps is published under an open license.