Good FREE 3D Modeling system, do they even exist?

Here's the skinny: I'm a 15 year old student, so i really don't have much time to figure out how to get Mechanisto to do what i want it to do. I would like to know if there are any other free modeling programs that i can download that are easy to learn and use and make good quality ships for EV (I'm starting off simple, cuz Nova looks like a pain in the ass to do plugs for.). I have resedit and all the other plugin stuff except for a good modeling program. Please help an aspiring plug developer!

Thanks!!!!

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