open-appsec is described as '(openappsec.io) in an open-source initiative that builds on machine learning to provide pre-emptive web app & API threat protection against OWASP-Top-10 and zero-day attacks' and is a web application firewall in the network & admin category. There are more than 10 alternatives to open-appsec for a variety of platforms, including Web-based, SaaS, Self-Hosted, Linux and NGINX apps. The best open-appsec alternative is Cloudflare, which is free. Other great apps like open-appsec are Anubis, BunkerWeb, Sucuri and UUSEC WAF.