FormSubmit is described as 'sends your site's form submission directly to your inbox without the need of any backend code or SMTP setup'. There are more than 10 alternatives to FormSubmit, not only websites but also apps for a variety of platforms, including SaaS, Slack, FormKeep and Facebook. The best alternative is Paperform. It's not free, so if you're looking for a free alternative, you could try Wufoo or Formspree.io. Other great sites and apps similar to FormSubmit are Getform (Freemium), Formbox (Paid), Basin (Freemium) and Formcarry (Freemium).