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[Contribute] Good open source project to learn ROS

Hello all!
I worked as ROS1 Junior Developer for 2 years (mainly in Python, but sometimes in C++). 3 months ago I changed job to DevOps/Developer but not connected with robotic industry :frowning:
The problem is, that my “robotics heart” still want to do something connected with ros. Could you recommend me some open source project, where I can contribute after hours and learn?

I think also about starting my own project: add conan package manager support to colcon, but I still have to do a lot of research.

Thanks for all your answers :smiley: