Top 20 NuGet anti Packages

Cleans HTML from constructs that can be used for cross site scripting (XSS)
Cloudflare JavaScript & ReCaptchaV2 challenge solving library (aka. *Under Attack Mode* bypass).
Rule based HTML sanitizer using a white list. Documentation at:
Google ReCaptcha wrapper class for quick and easy validation (injectable service for ASP.NET Core apps).
Anti duplication submit 。防重复提交。
ClearSale anti fraud platform client API.
ProceXSS is a Asp.NET Http module for preventing xss attacks.
A package to secure all controllers actions in your application by default by disallowing anonymous access, and requiring each HttpPost action to be passed an anti-forgery token. Anonymous access to a controller action needs to be explicitly set by use of an attribute.
You can do a lot of http requests through different proxies.