Tools

This is a Collection of useful tools

Multi purpose

 * ACA Tools
 * Rumkin.com offers you a vast collection of online tools to choose from.
 * The Black Chamber has a few very good visual online tools to help you analyzing basic ciphers.
 * Textmechanic.com is a collection of free, online, browser-based, text editing/manipulation tools.
 * Cryptool 2 is a complete suite for your crypto needs.

Playfair

 * Playfair Worksheet
 * Playfair encrypter/decrypter

Special purpose

 * Begedele's online tool helps decode messages based on 1W.jpg.
 * iIIustrious' Hiragana Caesar shift tool - input as numbers
 * jessie's RAR tool - tries the lower-cased, alpha-numeric lines from a text file on a rar file.
 * Sorgens' VBA Codebook Translation tool - Input text as 3-letter words in uppercase with spaces, updated with the annex.

Drop Codebook

 * Last version of codebook http://pastebin.com/kJPFR7dr
 * Latest annex to codebook http://snipurl.com/23thiy1

SSTV Images

 * RX-SSTV is a very good and easy to use SSTV receiving program.
 * MMSSTVis also very good and easy to use.
 * SSTVtoolsis a collection of tools including a very good SSTV image denoiser

​Audio

 * Audacity helps you cutting and correcting audio files.