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GeocachingToolbox.com. All geocaching tools a geocacher needs in one box: a lot useful geocaching tools, links, html tips and more.
quipqiup - cryptoquip and cryptogram solver
dtmf2num的在线版
Encoding and Decoding site. e.g. HTML Escape / URL Encoding / Base64 / MD5 / SHA-1 / CRC32 / and many other String, Number, DateTime, Color, Hash formats!
Malbolge language interpreter online ( JavaScript ). Malbolge, invented by Ben Olmstead in 1998, is an esoteric programming language designed to be as difficult to program in as possible.