E2Guardian - Web filtering solution
NaaS - Nudity-detection as a service run on solar powered Rasp Pi's
pfSense - pfSense is a free and open source firewall and router that also features unified threat management, load balancing, multi WAN, and more
uMatrix - uMatrix: A point-and-click matrix-based firewall, with many privacy-enhancing tools.
CacheGuard-OS - CacheGuard is an enterprise grade Web Gateway solution offering Web Security & Optimization in the same box. Price starting at $99 per Year!
Mockdown - Turn high fidelity UI images into mockups