What are some alternatives?
When comparing DD-WRT and CacheGuard-OS, you can also consider the following products
OpenWrt - OpenWrt is an open-source firmware based on Linux for wireless routers
Qustodio - Free parental control software. Monitor and track your child's online activity. Block dangerous sites and protect kids from online bullying.
MikroTik RouterOS - The main product of MikroTik is a Linux-based operating system known as MikroTik RouterOS.
FamilyShield - OpenDNS is the easiest way to make your Internet safer, faster and more reliable. Protect your family across all devices on your home network.
pfSense - pfSense is a free and open source firewall and router that also features unified threat management, load balancing, multi WAN, and more
LibreMesh - An Open Source Sofware for Geek-free Mesh Community Networks.