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Source code: https://github.com/cacheguard/CacheGuard-OS
Website: https://www.cacheguard.com/
Archangel is meant to be a sort of 'improved' version of dansguardian and uses the same default lists as dansguardian. It is basically dansguardian rewritten in python as an ICAP server as opposed to a proxy front-end. The benefits of archangel over dansguardian include:
1. Because it is an ICAP filter, it interfaces with squid and can do HTTPS filtering as well as regular HTTP.
2. Because it uses blocking modules and is written in python, it is extremely easy to write new modules for very complex, intensive blocking. I have already written a module that does content-based blocking of youtube videos.
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