and as for your altcoin list, each of those altcoins have already a website or an announcement topic on bitcointalk which people must visit instead.
your problem is not knowing how to search!
all the links above can be found with a quick google search.
https://www.google.com/search?q=bitcoin+website > first result is bitcoin.org
https://www.google.com/search?q=ethereum+website > first result is ethereum.org
https://www.google.com/search?q=monero+website > I don't know what getmonero.org is and what monero.org is so I continue the search like this:
https://www.google.com/search?q=monero+announcement+site%3Abitcointalk.org > first result, topic from 2014, 3833655 views, 1790 pages > everything checks out. > this has the links
the same approach can be used for others too. you can also use websites like coinmarketcap.com that list all these in one place.
(edit) what about your links ? are we sure they do not point to malware websites ?
I know they are not ! But you see what I mean