We don't know any good Romtos open-source alternatives yet.
You are more than welcome to suggest any alternatives that you know of, or ask the community for suggestions.
Alternatively, we recommend checking out LibHunt for open-source libraries and alternatives to Romtos.
For a long time I wanted to understand project management in GameFi, but I didn't know where to start. On Romtos I found a course that systematized the information. I really liked the fact that the training is based on real examples and provides concrete tools for work.