Yandex, the Russia-based search engine, has a handful of free-to-use tools, if you should ever feel the need, including a structured data validator and sitemap checker. You can never have too many tools… Here is a little list of some of them:
Use either a url or paste in a code snippet. Output is nowhere near as nice as Google’s tool
Check and validate pasted text, a url or an uploaded file
Paste in a URL and see if the Yandex bot can access the page/site
Of course you have Yandex’s own webmaster tools too: https://webmaster.yandex.com . Obviously you will need to register and validate your site as per Google and Bing.
Once you have a Yandex account you can then access additional tools such the Yandex keywords statistics tool wordstat: https://wordstat.yandex.com/