Very good, easy to use and powerful app, no question about it. Filezilla works well on all platforms and is free. So thanks to the developer. I give the full rating because I like it very much, its free and I have no complaints,
If you go to the developer website "Filezilla" the first download button you encounter will download FileZilla_3.30.0_macosx-x86_setup_bundled.dmg. This may contain some bundled adware. To be fair: it clearly says right below the button that "This installer may include bundled offers.". So: it does not secretly install anything without your prior knowledge of the fact.
So...the second link "Show additional download options" will open a new page showing the download link for FileZilla_3.30.0_macosx-x86.app.tar.bz2
Get this one. Once extracted you will have the Filezilla.app only.