SHKeeper is a self-hosted and open-source cryptocurrency gateway payment processor. It's integrate with popular CMS, any e-commerce, your own code or product
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Web app that can hash/hmac, encrypt/decrypt, and sign/verify the data, debug JWT tokens, parse and edit ASN1 structures, compute diffs, and more
Crypto Puzzles is a tool and library to provide a bunch of functions for encryption or pseudo encryption as puzzles or brain teasers. Awesome for kids but some puzzles are also a challenge for adults.