asm.ca.com/en/checkit.php - CA App Synthetic Monitor - Determines the download speed of your site in different parts of the world.
perma.cc - Perma.cc - Archiving of sites by a picture, snepshotom. Like the site, well, really liked it, and something happened to it and you lost everything, you can copy what you liked.
validator.w3.org - W3C MarkUp Validation Service - Online HTML, XHTML, SMIL, MathML, etc. Validator. It makes sense only if you want to make sure that your site is everywhere and always opens. W3C are very picky and reinsured.
varvy.com - Varvy - We watch how Google sees the site and see all the shortcomings.
delorie.com/web/wpbcv.html - Web Page Backward Compatibility Viewer - Allows site creators to see pages through tag filters.
schneegans.de/sv - XML schema validator - Validate XHTML 1.0 XML schema documents, with the detection of errors not found by other validators.
xtool.ru - xtool.ru - Check sites for the quality of links when promoting sites in Yandex. Defines the spam, filters, external links and keywords, the history of TCI, shows the indexing schedule of the site and ...
w3.org/people/raggett/tidy - HTML TIDY - Dave Raggett's free cross-platform utilities for cleaning HTML.
watson.addy.com - Dr. Watson - Check for errors in the HTML code.
Checking the accessibility of the site
sitestatus.ru - Checking the accessibility of the site - A simple check in an accessible form.
downforeveryoneorjustme.com - down for everyone or just me? - Check if the site is lying and if it is, for what reason. Say, we went to the site, but it is not available, I would like to know, for a time or forever?
Command
ui-cloud.com - UI Cloud - The largest collection of interfaces in the world.
Copyright
content-watch.ru - Content Watch - Automatic control of uniqueness. We learn whether we use the content of another site in order to preserve its uniqueness. Or you can just find out, give a link and source.
Determination CMS
uitest.com/en/check - UITest - A large number of tests. For example, you can find out which CMS is used on a particular site.
2ip.ru/cms/ - 2IP - Identifies the use of CMS site of the most famous.
Feedback form on website
website.grader.com - Hubsport Marketing Grader - Evaluation from the point of view of marketing.
Graphic arts
thestarterkit.info - The Starter Kit - Source for programmers and designers.
landscape.io - Landscape - Early warning system for Python code base.
nic.ru/whois - Regional Network Information Center - WHOIS-service of the domain registration center RU center. Provides information on IP addresses and domains around the world. Sometimes it hangs.
mxtoolbox.com - MXToolbox - Verification of correctness: MX records of the domain, SMTP server of the domain, the presence of IP in the blacklisting lists.
For those who make websitesA handbook and a self-tutorial of the basics of web programming, one that is indispensable. The directory is well-structured, understandable and rich in information.
SimilarSitesSimply enter the url of the site and the service displays a list of sites-competitors. That is, the sites are supposedly of the same theme. Not all sites are really suitable, but many guesses. Curious to see, compare.
Bubbl.usThe best way to put things in order is by using the clever Bubbl.us map. Save it for later use to continue the thought process, print it out or send it to e-mail to follow through to the implementation.
BuiltWithThe company's Internet services, the trends in the development of web technologies and information technologies for Web search. The goal is to help web developers, researchers and designers find out what web page technologies are using that will help them decide which technologies to implement themselves.
W3C CSS Validation ServiceValidator from W3C (The World Wide Web Consortium).
Since the validator is here, it means that if your CSS arranges it, then it will work correctly everywhere. The site is official.
I was generating a large CSS file, and there was some mistake. In such a large file, it is rather difficult to look for an error. Gave a link to this service and he immediately showed me what to do.
You can give a link to the file, upload a CSS file or enter the code into the form.
He will think a little and tell you what's wrong here.
Responsive Design CheckerWe test the site for adaptability of design. We enter the address of the site and see how it will look in different devices: computer, tablet, smartphone, Mac, iPad, Nexus, iPhone.
Table of special characters online. Click on the symbol and it's on the clipboard. You can collect a few and copy at a time. And then paste where you like.
IstioThis is a free online text analysis service. It is designed for copywriters and article customers. Analyzes such SEO parameters as text length, number of words, nonsense, keyword density, water in the text (wateriness), and other useful little things.
