The first link (https://www.evisa.gov.tr/) is the correct one. The
gov.tr domain is a good indication that this is an official website from the Turkish government.
The second link (https://turkeyvisa.com.tr/) is quite suspicious (not a government domain, and if you start the application process it heavily pushes you towards paying extra for quicker processing before you even input your personal details) and I would not use it.
The third link (https://konsolosluk.gov.tr/) is also an official Turkish government site (again, see the
.gov.tr domain). This one seems to be for general consular information rather than visas specifically - if you go to the 'visa' section, you are directed to the first link.
The fourth (https://www.turkey-travelpermit.com/) explicitly states on the homepage (although in a fairly bland part of the page that most people will skip over without reading) that it's neither part of nor affiliated with any government agency:
This Website is a professional travel agency that aims to help individuals and companies complete the necessary travel authorization requests for short-term stays. There is a service fee, which includes expert help and assistance, and the fees charged by the Government. www.turkey-travelpermit.com is not affiliated with the Government or its sponsors. An application can also be submitted for a lower cost through the Government’s website here, though this would be without our professional review and expert service.
The fifth (https://www.visasturkey.com/) similarly has in its footer:
Disclaimer: This company is not affiliated with the Turkish government. www.visasturkey.com is intended to help individuals and legal entities in their administrative travel paperwork to enter Turkey for a short term stay.
The sixth (https://www.onlinevisa.com/turkey-visa/) offers "expert review" and "Approved visa or money back" - these certainly aren't common services on an official visa portal. It also offers a "simplified application form", which may prompt you to ask "simplified in relation to what?" (presumably the official form). It also offers visa applications for several countries. That's not an immediate red flag (VFS Global provide official visa application services for many countries, and there may well be other similar companies too), but it's not typical and is a sign that you might want to look for verification first.
Not all countries have a domain equivalent to
.gov.tr, but many do.
If you're struggling to work out which visa application sites are legitimate for a country, I'd suggest starting by searching for relevant government websites. The foreign ministry of a country is often a good start - visa information is usually easy to find, and (unlike visa application websites) there aren't typically private websites trying to look like they're some country's foreign ministry. A local embassy or consulate may also be a good place to start, for similar reasons.
Why is there no place where you can officially authentically verify a website, if it is original or phishing.
That's not a simple task. Who determines whether a website is authentic, and ensures that decision is kept up to date?
Note that the non-official websites aren't necessarily phishing - many of them work perfectly well, they just take the information you put into their system and put it in the official application system, then charge you all the usual costs plus a "service fee" for themselves. They haven't provided a meaningful service in return for that fee, but you still get the visa just the same. So it's more like scalping than phishing. Of course, that's still not a good omen about their intentions, and I certainly don't recommend using them!