My 2 favorites are the free Real Time Render SimLab Composer Lite ! (max 1980*1040 )
https://www.simlab-soft.com/3d-products/simlab-composer-lite.aspx?utm_source=free_tools

Super easy : accepts quasi all 3D formats (except 3DM from Moi so take OBJ from Moi)
So you can import and mix many different things!

And the Free TwinMotion 2019 - 2020 without any limitations - terrific simplicity and such vegetations wind, snow, ocean animation's camera etc...
( free if you had downloaded the 2019 by Epic Games) who is even more easy if possible!