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

Please click here to take a 3-minutes survey and help us improve our support to you!

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?

We have also created a dedicated area with answers to the most common technical questions. Please visit our Technical FAQ page to find out if your question is answered.

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:

  • Merry Christmas!
  • The Popular Toolchain for Renesas RX Receives An Update Today (Release 2020q4)
  • Updated Toolchains for Renesas RX and RL78 Have Been Released (Release 2020q2)
  • Both Renesas RX and RL78 Toolchains Get Refreshed Today (Release 2019q4)
  • The Renesas RX and RL78 Targets Get Updated Toolchains Today (Release 2019q2)

     Do You Need Help?

    If you need help navigating through this website, registering your account or requesting support, we have prepared an easy-to-use and comprehensive User’s Guide to GNU Tools.

    Click here to read more about what this guide contains and how it may help you.

     Get In Touch

    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.

     Our Community

    Our growing community is formed by professionals all over the world, working in various fields of technology and different platforms. You are always welcome to register and become a part of it!

    We currently have 13,802 registered users in our community.