Over a six-month period, we analyzed usage of open-source (code) by collecting data from 12–14 large development projects based on Java. We have extracted the following vital statistical data from these projects: The source code was deployed. Source code written in-house (including libraries). External open-source code (including libraries). External closed source code (including libraries). The result was amazing. Data shows that approximately 76% of code is open-source code, less than 7 % is closed external code, and 17% is developed in-house.