Any other open source game engines other than godot?

Just curious if there are more open source engines. godot is the most well known one but are there others that can compete with godot? Ive been doing something, what i like to call "engine hopping" which really bugs me that i do. pretty much i can never stay with one engine and i just hope from one to another and back to others. Is there a way to not engine hop.

Im still curious if there is more than just godot that is open sourced and still active.