The Big Mastodon Hashtag Search -- https://mastogizmos.com/bmhs.html
The Big Mastodon Hashtag Search searches 14 popular Mastodon instances with the option for you to add your own.
The search results offer a number of filters. There's a slider where you can filter by social score (calculated based on the number of replies/reposts/favorites) and a number of filtering checkboxes for recency, content marked sensitive, bots, verified accounts, etc. You can also keyword-search returned results.
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