I wouldn't say that we have official clients because there's no central group who decides what the reference clients are, but we do have
de facto clients that the community agrees on, such as Bitcoin Core and Electrum for desktop, Bitcoin Wallet for Android (along with an Electrum app), and at least two LN implementations - lnd and c-lightning.
Because Bitcoin is not a centralized organization, there is no reference explorer or price conversion tool. Third party commercial companies make explorers, and usually its exchanges who make price conversion tools, and of course there can't be an official bitcoin exchange.
Also, there can't really be an official price ticker; each exchange quotes slightly different prices as a result of slightly different buy/sell activity on each.
But
Blockchair (as ranochigo previously mentioned) is held in high regard by this community, because it gives you the most details about transactions, addresses and blocks. More than any other explorer. Another explorer really popular is
Walletexplorer. It additionally can link related address together and guess which addresses belong to the same wallet or service. Think of it as a free Chainalysis service (the founder was later hired by them).
