HttpMaster - HttpMaster is a professional software tool for testing and debugging HTTP applications, primarily aimed at REST API applications and web services.
TinyWall - Lightweight and non-intrusive firewall
Hoppscotch - Open source API development ecosystem
SonicWall - SonicWall security solutions protects your network, systems, users and data from cyber threats.
Request inspector - Debug web hooks, http clients
pfSense - pfSense is a free and open source firewall and router that also features unified threat management, load balancing, multi WAN, and more