Bridging the gap between proprietary and open-source development tools

We provide an easy to follow approach to developers by bridging proprietary and open-source development tools. More »

Enhance your business and grow easily

With our solutions, your business receives more for less. Because we believe that your success, is our success. More »

Bring innovative ideas to life

Feel the freedom to express and innovate. With our solutions, your software is delivered on time and support is prompt. More »

Not just machines. More than hardware. A touch of passion.

Our goal is significantly expanding both our and your horizon to a level that goes beyond the electronics and circuits. We promote passion. More »

Explore the digital era in unique and powerful ways

We aim to take you further into the digital era and connect the dots in making software and hardware work together brilliantly. More »


Welcome to the GNU Tools website

GNU Tools are free, user-friendly GNU toolchains for Renesas micros with free customer support across the world.


Not satisfied with just providing high-quality products, we also provide integration with the Renesas e2 studio and professional technical support for our products worldwide for free.

Register now for free and get unlimited downloads and support – it’s easy:
1. Register on our website
2. We’ll send your username and password by email
3. Login and download installers for your chosen tools
4. Run the installers
5. Develop your application using either the Renesas e2 studio or Makefiles

If you have any questions, just ask our experienced support team via this website, or talk to other users on our discussion forum.

Do You Need Technical Support?

Please find below quick answers to the list of most common questions asked by our users:
1. Where do I find my activation code?
2. My activation code does not work, what should I do?
Another source of useful information is our dedicated support forum, while questions about the site functionality and general overview are usually covered in the Frequently Asked Questions area of our site.
If you cannot find the answer to your question above, please open a new support request and we will assist you promptly.

Latest News

The following below are the latest updates available on our site:

CyberTHOR Studios Ltd. is an international software development and consultancy company, also offering consultancy services in connection with Renesas devices and software. We would be happy to discuss how we can help you. Click here to visit our website and contact us.

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