Programs for interior planning / design of one's own home

Hello,

since we are now moving into financing, I wanted to ask if you know any good and free programs that can help with creating a scale-accurate interior plan and allow for a bit of experimenting.

Wall in, wall out, remove window, bathroom planning, etc.

Have you had good experiences with any free program?

Thanks in advance.

The best thing ever (free, user-friendly, good results, large database of objects, borrow floor plans,...) that can do everything does not exist.

I ended up with Sweet Home 3D - rather strong in interior visualization, but weak in plans.