Company Corvin Hartmann created these great apps:
BigMap, CashCounter: Der Geldmanager, FillliT, Maths: Minimalist Mental Maths, custometer, MapDraw: Draw on maps, Physics: Learn Formulas, AiringCycle, Westbahn, DevUtility: Create better apps, Thoughts, GreekAlphabet: From α to Ω, Tracks: Measure your routes, and others..
