NNTPCache (efficiently) executes on the localhost pretending to be an NNRP news reading server. In fact, what it does is pass certain NNTP commands through to real (remote and possibly local) news-servers based on various pattern matching rules. NNTPCache then takes the output from those servers and caches & indexes it in funky ways (much case specific magic goes into this). The next time such information is asked for, or other information which can be logically inferred from the previously collated information, it is sent directly from the cache, without consulting the remote servers.
nntpcache-2.3.3: description + notes
NNTPCache can transparently merge local newsgroups & multiple remote feeds (usually handled by INN) with remote NNRPD and NNTPCache servers to create mind-bogglingly large "virtual" newsfeeds, without having to negotiate for standard feeds or allocating anything like bandwidth or drive space normally required (normally around 3-10G/day).
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