Yes you have heard correct!
TibiaData is present on GitHub now and we have started with our rewrite of Golang (v3) to be open-source and publicly available.
So why not check out the code for TibiaData v3 that is currently in beta?
In this case, head over here: https://github.com/TibiaData/tibiadata-api-go
As right now, the v3 is still in beta and we are developing on it. So why not help out and contribute to the project?
All contributions are welcome!