Proxy-based internet filtering solution requires you to setup a proxy server, either transparent or non-transparent, then you can setup policies to filter web access. There are a lot open source or free products. This solution has below advantages and disadvantages.

Advantages:

1. Free or open source.
2. Can filter websites.

Disadvantages:

1. Most are linux-based. You need a linux pc to setup the proxy.
2. No support.
3. Less features. Only for domain filtering.
4. Add network latency.

Comparison

Proxy-based internet filtering solution is similar to the “website black list” in your router/firewall. If you only need to block some sites, it’s an option.

With WFilter ICF, you will get:

1. Enterprise-level internet monitoring and filtering features.
2. Dedicated support.
3. No influence to network performance.
4. Easier to be deployed.