The best alternatives to Surge are HardyPress, Metalsmith, and sttr. If these 3 options don't work for you, we've listed a few more alternatives below.
What do you think of Surge?
Haggle — A CTA buyers want to click, when they aren't ready to demo
HardyPress is platform that hosts your WordPress installation securely and generated static pages that load faster and protects your site from malicious attacks.