WordPress, Hugo, Blogger, Jekyll, Indexhibit, Drupal, Joomla, DEV Community, Sculpin, ProcessWire, WonderCMS, HTMLy, Nibbleblog, Zimplit CMS, Typesetter, Pico CMS, Phalcon, Awestruct, PHP Fat-Free Framework, Adianti Framework, Fansoro, Jas CMS, razorCMS, Obullo, feindura, 99ko CMS are some alternatives to Backdrop CMS.