The organising unit is the concept, not the philosopher — so you arrive at an idea and find out who first had it, rather than starting with a name you already know. Entries run 100 to 300 words, peer-reviewed, browsable by concept, keyword or thinker, and they stretch from antiquity to the twenty-first century. Free and open access out of Paderborn University, edited by Ruth Edith Hagengruber and Mary Ellen Waithe.