pfSense - pfSense is a free and open source firewall and router that also features unified threat management, load balancing, multi WAN, and more
DataMask.tech - Mask private data before taking screenshots
OPNsense - OPNsense® you next open source firewall. Free Download. High-end Security Made Easy™. Offers Intrusion Prevention, Captive Portal, Traffic Shaping and more.
Image Blur - Hide your sensitive data with a click
IPFire - IPFire is a server distribution with intended to use as a firewall.
GitGuardian - Detect secrets in source code, public and private!