Draw a molecule, or paste a SMILES, and the site turns it into three-dimensional shapes: one geometry per torsion set, relaxed with MMFF94 and listed by relative energy, with the SDF ready to download.
Everything runs in the page. The structure is never uploaded, there is no queue and no account, and the conformers appear as fast as the browser can build them.
Conformers in 3D from a structure you draw. This tool needs JavaScript; these are the pages it offers: