Some things are unpredictable. For example, the impact of PaDEL by Chun Wei Yap. While seemingly just providing a simple API around CDK's descriptor and fingerprint functionality, it's impact is significant. Higher than, for example, that of Bioclipse and AMBIT which also provide GUIs around that functionality.
Web-of-Science lists 71 citations of this work, while Google Scholar guestimates it at around 120. Well done!