This is the stuff I've counted so far (I know they are not all React alternatives): Preact, Mithril, Crank.js, Hyperscript, Reagent, Closurescript, Elm, Cycle.j

This is the stuff I've counted so far (I know they are not all React alternatives): Preact, Mithril, Crank.js, Hyperscript, Reagent, Closurescript, Elm, Cycle.js, Lit-html, Haml, Slim, Jsx, Meiosis, Svelte, Formik, Vue...