[BBLISA] Home router/NAT/firewall linux software?

[Alex Aminoff]

My project: build a home firewall/NAT box on which I can have a web app 
where my kids check off when they have done their chores in order to get 
screen time (aka internet access).

The web app I can write. I can build a firewall/NAT box by hand in 
iptables, but do I have to?

On the one hand, I found several complete distributions that do this: 
m0n0wall, smoothwall, etc. On the other hand, what I would like is 
software that does most of what those bundled distributions do that I 
can install on my existing linux system. In that realm all I have found 
is use raw iptables or things called apf and csf, which appear to be 
geared towards an ISP rather than a home network; in particular, I would 
worry that they would take over and clobber the NAT configs. So my 
question is, can one get the nice software built for the m0n0wall or 
smoothwall distros as standalone packages that can be installed on any 
other linux? (In my case Scientific Linux, a RHEL clone).

Thanks,
  - Alex