Fee-charged is fine if there's a free trial and/or a great reputation.
Thanks for an informative reply. It'd have to be a free trial, I guess. In this domain reputations can be purchased and are mostly worthless; in other domains, reputations cannot be purchased and are mostly priceless.
I'm not aware of anything along the lines you describe (not that I claim any authority in the matter). As far as I know, the nearest match is altcoincalendar.info but that's a long way from your requirements because i) it's just a calendar and ii) the content is somewhat variable in terms of detail and significance - it is dependent on the API receiving genuine announcements vs joke material. And that's really where the problem lies; the information is unreliable at source, joke or otherwise. It'd be a case of garbage in, garbage out.
Things may be looking up though. I've noticed an increasing number of comments recently calling/hoping for increased transparency so perhaps attitudes are starting to harden towards misinformation and deliberate disingenuity.
I envisage a transparency-oriented scheme, analogous to the FOSS "Description of a Project" DOAP scheme, that publishes altcoin core metadata in a computationally-tractable format. This would at least enable you to apply your own programmatic filters or simply browse summaries of the latest announcements.
We're not there yet, though.
Cheers,
Graham.