Free open source alternative app list of AWS WAF :

Cloudflare

Make employees, applications and networks faster and more secure everywhere, while reducing complexity and cost.

FreemiumWindowsmacOSLinuxAndroidiOS

SafeLine

The Best Free WAF For Webmaster. SafeLine is a simple, lightweight, locally deployable WAF that protects your website from network attacks that including OWASP attacks, zero-day attacks, web crawlers, vulnerability scanning, vulnerability exploit, http flood and so on.

FreemiumWindowsmacOSLinux

Others are looking for free open source alternatives of following apps:

AI & Machine Learning

Free open-source AI & machine learning tools.

Acorn 7

Acorn 7 is a Mac image editor for editing photos and creating graphics.

Ad Blocker

Ad Blocker is a browser tool that removes intrusive ads and pop-ups from web pages.

AdGuard DNS

AdGuard DNS is a DNS-based service that blocks ads, trackers, and malicious websites.

Adobe Premiere Pro

Adobe Premiere Pro is a professional video editing software for film, TV, and web.

AdGuard

AdGuard is a cross-platform ad blocker that filters web content and protects privacy.