# deegree
**Wikidata**: [Q1182309](https://www.wikidata.org/wiki/Q1182309)  
**Wikipedia**: [English](https://en.wikipedia.org/wiki/Deegree)  
**Source**: https://4ort.xyz/entity/deegree

## Summary
deegree is free, open-source geographic information system (GIS) software written in Java, designed for building spatial data infrastructures. It implements standards from the Open Geospatial Consortium (OGC) and is distributed under the GNU Lesser General Public License (LGPL). The platform runs on the Java virtual machine and is maintained as an active GitHub project with a continuous integration workflow.

## Key Facts
- Instance of: free software (GNU Lesser General Public License)
- Primary use: geographic information system
- Programming language: Java (platform: Java virtual machine)
- Website: http://www.deegree.org
- Source repository: https://github.com/deegree/deegree3
- Notable releases: 3.0.0 (2010-11-15), 3.1.0 (2011-10-25), 3.4.9 (2019-09-06)
- Wikipedia presence: English and German articles (sitelink_count: 2)
- Twitter handle: @deegree_org (active since March 2010)
- Software quality assurance: continuous integration via Travis CI

## FAQs
### Q: What is deegree used for?
A: deegree is used to build and operate spatial data infrastructures, providing implementations of OGC web services and standards for geospatial data management.

### Q: Is deegree free to use?
A: Yes, deegree is free software distributed under the GNU Lesser General Public License (LGPL), allowing users to run, study, modify, and distribute it.

### Q: What programming language is deegree written in?
A: deegree is written in Java and runs on the Java virtual machine, making it cross-platform compatible.

### Q: Where can I download deegree?
A: deegree source code and releases are available on GitHub at https://github.com/deegree/deegree3.

### Q: When was deegree 3.0 released?
A: deegree version 3.0.0 was released on November 15, 2010, followed by subsequent patch releases through 2019.

## Why It Matters
deegree plays a significant role in the geospatial software ecosystem as one of the few mature, free software implementations of OGC standards. By providing a Java-based framework for spatial data infrastructures, it enables organizations—particularly in the public sector, research, and environmental domains—to build interoperable geospatial services without proprietary licensing costs. Its long development history (with version 3.0 launched in 2010 and active releases through 2019) demonstrates sustained community and institutional support. The adoption of continuous integration practices ensures code quality and reliability for production deployments. deegree's dual English and German Wikipedia presence reflects its strong user base in Europe, where open-source geospatial solutions are widely adopted for INSPIRE compliance and national spatial data infrastructure initiatives.

## Notable For
- Being free software implementing OGC standards for spatial data infrastructures
- Long-term active development spanning from at least 2010 through 2019
- Cross-platform availability via Java virtual machine
- Open-source licensing under LGPL, enabling commercial and non-commercial use
- Continuous integration workflow for quality assurance

## Body

### Licensing and Classification
deegree is classified as free software, distributed under the terms of the GNU Lesser General Public License (LGPL). This licensing model grants users the rights to freely run, study, modify, and distribute the software and its modified versions.

### Technical Architecture
deegree is implemented in Java, an object-oriented programming language first released in 1995. The software executes on the Java virtual machine, providing platform independence across operating systems. The project employs continuous integration for software quality assurance, with build configurations maintained in the repository.

### Version History
The deegree project has maintained an active release schedule. Key releases include:
- 3.0.0 — released November 15, 2010
- 3.0.1 — released November 26, 2010
- 3.0.2 — released December 17, 2010
- 3.0.3 — released March 4, 2011
- 3.0.4 — released May 6, 2011
- 3.1.0 — released October 25, 2011
- 3.1.1 — released November 8, 2011
- 3.1.2 — released February 29, 2012
- 3.4.8 — released August 16, 2019
- 3.4.9 — released September 6, 2019

### Project Resources
- Official website: http://www.deegree.org
- Source code repository: https://github.com/deegree/deegree3
- Official Twitter account: @deegree_org (established March 2010)
- Wikipedia articles available in German and English

### Development Infrastructure
The project uses Travis CI for continuous integration, with configuration stored in the repository. The source code is hosted on GitHub, facilitating collaborative development and issue tracking. Release notes and version tags are published through the GitHub releases system.

## References

1. [Release 3.0.0. 2010](https://github.com/deegree/deegree3/releases/tag/3.0.0)
2. [Release 3.0.1. 2010](https://github.com/deegree/deegree3/releases/tag/3.0.1)
3. [Release 3.0.2. 2010](https://github.com/deegree/deegree3/releases/tag/3.0.2)
4. [Release 3.0.3. 2011](https://github.com/deegree/deegree3/releases/tag/3.0.3)
5. [Release 3.0.4. 2011](https://github.com/deegree/deegree3/releases/tag/3.0.4)
6. [Release 3.1.0. 2011](https://github.com/deegree/deegree3/releases/tag/3.1.0)
7. [Release 3.1.1. 2011](https://github.com/deegree/deegree3/releases/tag/3.1.1)
8. [Release 3.1.2. 2012](https://github.com/deegree/deegree3/releases/tag/3.1.2)
9. [Release 3.4.8. 2019](https://github.com/deegree/deegree3/releases/tag/deegree-3.4.8)
10. [Release 3.4.9. 2019](https://github.com/deegree/deegree3/releases/tag/deegree-3.4.9)
11. [Source](https://download.deegree.org/documentation/3.4.13/html/index.html)
12. [Source](https://github.com/deegree/deegree3/releases/tag/deegree-3.5.5)
13. [Source](https://github.com/deegree/deegree3/releases/tag/deegree-3.5.6)
14. [Release 3.5.7](https://github.com/deegree/deegree3/releases/tag/deegree-3.5.7)
15. [Release 3.5.8](https://github.com/deegree/deegree3/releases/tag/deegree-3.5.8)
16. [Source](https://api.github.com/repos/deegree/deegree3)
17. Quora