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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.
quipqiup - cryptoquip and cryptogram solver
Rumkin.com
Encoding and Decoding site. e.g. HTML Escape / URL Encoding / Base64 / MD5 / SHA-1 / CRC32 / and many other String, Number, DateTime, Color, Hash formats!