Universal Tools for Converting, Decoding ...
Available now:

MultiConv:
Convert text to/from ASCII in decimal, binary, hex, octal, base32, base64 ... in all directions. NEW: Download a datafile

MultiROT:
ROT functions: ROT13, ROT18, ROT47 (all with bruteforce like Caesar), ROT5 and Atbash

MultiROT (light):
ROT functions: ROT5, ROT13, ROT18, ROT47, Atbash and ROT13 Ceasar

MultiROT (az09):
Rotates using alphabets [az] and [09] as well as [az,09] with bruteforce and Atbash (used for some Ingress passcodes)

MultiABC:
Convert letters to numbers (A=1, B=2 ... Z=26 etc., A=2 .. Z=101 (primes), A..M=0, N..Z=1, telephone keyboard), calculate sum of numbers and digits and digit sums.

Numbers2Text:
Convert numbers to letters (1=A, 2=B ... 26=Z etc.)

Number Converter:
Convert numbers of any length: Base10 (decimal), Base2 (binary), Base8 (octal), Base16 (hex); Base58 and Base62 (in 2 variants)

Analyse Text:
Count occurences of characters in text

Letter frequencies:
Analyze letter frequencies, Bigrams, Trigrams etc.

Skip:
Rearrange string by skipping x characters

Rectangles:
Reformat text to rectangles (using prime factors or all variants)

Transposition:
Exchange rows and columns

MorseDec:
Decodes Morse with "autodetect" (./ or 0/1 can be used as input), also decodes the inverted and/or reversed inputs.

Railfence:
Railfence decoding with bruteforce  up to all possible rails and offsets.

Vigenere cipher:
Decrypt and encrypt text

String Wizard:
Manipulate Strings: uppercase, lowercase, remove whitespace, alpha, nonalpha, numbers ...

NEW:
Bitstream Analyser:
Splits bitstreams in different ways and interprets it as ASCII, displays it in Hex.
Coming soon:

AutoCrack Vigenere cypher (using KasiskiAnalysis)

AutoCrack Substitution cypher (using FriedmanTest)

Skytale encryption
Other tools: