Hi! We're Scirra Ltd, and we make Construct, powerful browser-based tools for game development and animation.
Construct is primarily a closed-source commercial tool. However we use GitHub repositories for tracking issues, such as the Construct bugs repository, as GitHub's issues feature works very well for the purpose. We also have some open-source components available here in the repositories shown below. They include the code for our Addon SDK, and a couple of plugins like our Steamworks and Epic Games integration.
If you have any questions about Construct or need any help, you'd be best off heading to our main website where we have forums, FAQs, contact information, comprehensive documentation, and more.