Open Source Software – Definition and meaning

Definition and key features

Open source software comprises computer programs whose source code is publicly accessible. Anyone can view, modify and redistribute this code. In contrast to proprietary software, the source code does not remain hidden, but is made transparent, whereas proprietary offerings are usually protected by restrictive licence conditions. The open source development model is based on collaboration: developers from all over the world contribute their knowledge in order to continuously improve and adapt software or fix bugs. Open source licences such as the GNU General Public License (GPL), the MIT licence or the Apache licence provide important legal guidelines. They stipulate how programmes may be used, modified and distributed and thus contribute to clearly defined conditions.

Development models and functionality

Openness and transparency characterise the development and maintenance of open source software. The source code is usually shared and openly documented via platforms such as GitHub or GitLab. Not only individuals, but also companies can actively participate in development by suggesting changes or submitting so-called "pull requests". Coordination often takes place collaboratively or under the leadership of a core team that manages further development in a structured manner.

The development of the Linux kernel illustrates this principle: thousands of developers from all over the world are continuously working on this project. The projects surrounding the Apache web server, the Mozilla Firefox browser and the WordPress content management system are similarly open. These examples show how flexible and customisable open source software is. The ability to test code openly speeds up the identification and elimination of vulnerabilities considerably - a clear advantage over many proprietary systems, where only a limited group of people have access.

Areas of application and deployment scenarios

The spectrum of open source software ranges from operating systems and programming languages to productive applications for everyday use. In the field of web development, for example, frameworks such as Django (Python) or Ruby on Rails are used. Scientific research benefits from solutions such as R or Jupyter Notebooks for the analysis and visualisation of large amounts of data. LibreOffice has established itself in many places as an alternative to well-known commercial office suites. Another vivid example is the container orchestration solution Kubernetes: originally initiated by Google, it is now managed by the Cloud Native Computing Foundation. This allows companies to set up their own cloud solutions without being tied to a provider.

Smaller companies and start-ups use open source software to react flexibly to individual requirements, as it does not incur any licence costs and can be modified as required. Administrations and educational institutions are also increasingly turning to open software solutions - whether for cost reasons or to strengthen digital sovereignty and retain control over the technologies used.

Advantages, challenges and recommendations

Open source software has many advantages: it is freely available, enables cost savings, offers extensive customisation options and impresses with the openness of its source code, which makes it easier to check for security and functionality. Companies can rely on a committed developer community that regularly provides further developments and updates. However, there are also challenges, such as seamless interaction with existing IT systems. Customisation and long-term support usually require specialist expertise and dedicated resources. Particularly if there is no professional support contract, the responsibility for operation and security lies increasingly with the user company.

In order to minimise risks and benefit in the long term, a thorough evaluation is recommended before using open source software. This includes analysing community activity and assessing project stability as well as comparing it with internal company guidelines and compliance requirements. Through the targeted expansion of internal knowledge in dealing with open source and, if necessary, supplementary support services from external service providers, potential can be tapped securely, efficiently and sustainably.