would it be possible to test mixxx google summer of code to see its evolution
Sure, have a look at the pull requests on GitHub. You can check out the code, test the changes yourself and help reviewing them.
- New Beat UI (Harshit Maruya): https://github.com/mixxxdj/mixxx/pull/2961
- Analyzer improvements (Cristiano Lacerda): https://github.com/mixxxdj/mixxx/pull/2930
- Macros (Janek Fischer): https://github.com/mixxxdj/mixxx/pull/2989