HIBK allows you to check if you have a bitcoin address that is likely known to surveillance. Inspired by Have I Been Pwned, it's an open source tool that analyses recent transactions for 'privacy gotchas' and shows relevant obfuscation tools based on results.
Nice! I have a few coins I can check this out with. I'm not as familiar with the privacy aspect so this can be a good start
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Found this search engine and used it for the opposite reason for which I understand its purpose.
My bitcoin core wallet was stolen. All the mining rewards in that wallet.dat sucked out of my possession - would love to know who is CoinJoining my hard earned BTC. Not cool. Not F-ing cool.
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It's a quick check of common issues that might make one Bitcoin less desirable than another.
CEO Short List
Humans Not Invited