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FOSS Energy Efficiency Project (FEEP)

How can you measure software's energy consumption? And does it make a difference? We are working to make free software more sustainable.

Blauer Engel For FOSS (BE4FOSS)

Eco-labels for products are used widely already. But how can they be transferred to software? What criteria is relevant? We need more pioneers to find out how we can make software sustainable.

KDE Eco -

KDE supports the FEEP and BE4FOSS programs to help free and open source communities produce more environmentally friendly software. The projects provide communities with guidelines and support to optimize software to be more energy efficient and have a longer life-span.

Let’s make energy efficient software and digital sustainability part of our community! We can live up to our responsibility for this and future generations!

Okular Awarded Blue Angel Ecolabel

Okular Awarded Blue Angel Ecolabel

In 2022, KDE's popular multi-platform PDF reader and universal document viewer Okular became the first ever eco-certified computer program!   Read More

Get Involved

Join us for a sustainable software development movement!

FOSS Energy Efficiency Project (FEEP)

Image of globe with computer mouse
Image of globe with computer mouse

FEEP is developing tools to improve energy efficiency in free and open source software development. Design and implementation of software has a significant impact on the energy consumption of the systems it is part of. With the right tools, it is possible to quantify and drive down energy consumption. This increased efficiency contributes to a more sustainable use of energy as one of the shared resources of our planet.

Blauer Engel For FOSS (BE4FOSS)

In 2020 the Umweltbundesamt ('German Environment Agency') released the award criteria for obtaining eco-certification with the Blauer Engel label for desktop software. Categories for certification include energy efficiency, extending the potential operating life of hardware, and user autonomy … all of which fit seamlessly with free and open source software.

The BE4FOSS project advances eco-certification for resource efficient software in the FOSS community. Obtaining the Blauer Engel label occurs in 3 steps: (1) MEASURE, (2) ANALYZE, and (3) CERTIFY.

  1. MEASURE in dedicated labs, such as at KDAB Berlin
  2. ANALYZE using statistical tools such as OSCAR (Open source Software Consumption Analysis in R)
  3. CERTIFY by submitting the report on the fulfillment of the Blauer Engel criteria

The benefits of obtaining the ecolabel include:

  • Recognition of reaching high standards for environmentally-friendly software design
  • Differentiating free software from the alternatives
  • Increasing the appeal of adoption for consumers
  • Promoting transparency in the ecological footprint of software

Image of Blauer Engel ecolabel

How you can help

  • Follow 3-steps to Blauer Engel eco-certification: (1) Measure, (2) Analyze, (3) Certify
  • Squash bugs labelled 'efficiency'
  • Set up a measurement lab in your community
  • Develop automation tools for energy consumption measurements
  • Assist with statistical analysis and related tools (e.g., OSCAR)
Image of computer directory with globe


The BE4FOSS Project was funded by the Federal Environment Agency and the Federal Ministry for the Environment, Nature Conservation, Nuclear Safety and Consumer Protection (BMUV). The funds are made available by resolution of the German Bundestag.

The publisher is responsible for the content of this publication.

Image of BMUV/UBA

Image of BMUV/UBA