F5 Advanced Firewall Manager - Stop even the most massive and complex DDoS attacks with BIG-IP Advanced Firewall Manager: advanced data center protection against layer 3–4 threats.
ElectroDroid Pro - ElectroDroid Pro is an app that provides you electronic references and tools with detailed explanations.
pfSense - pfSense is a free and open source firewall and router that also features unified threat management, load balancing, multi WAN, and more
HScope - HScope is one of the best mobile apps introduced by MartinLoren that help you in making your USB Oscilloscope portable to analyze up to 1000 scans per second effortlessly.
FireMon - FireMon Security Intelligence Platform delivers continuous visibility into and control over firewall infrastructure.
ECStudio - ECStudio app provides you with features that allow you to learn about the building of electric circuits and electronic circuit simulation so you can calculate various values of circuits right at your fingertips.