JPEG

FP10 – Asynchronous jpeg encoding width Alchemy
http://segfaultlabs.com/devlogs/alchemy-asynchronous-jpeg-encoding
http://segfaultlabs.com/devlogs/swf/alchemy/jpeg_alchemy.zip

FP9 – Merging BitmapData objects to single JPEG file
http://blog.inspirit.ru/?p=289
http://blog.inspirit.ru/wp-content/uploads/jpgmerge/jpeg_encoder.rar

GIF

http://code.google.com/p/as3gif/

Decoding
http://as3gif.googlecode.com/files/GIFPlayer%200.6.zip

Encoding
http://as3gif.googlecode.com/files/GIFEncoder%200.1.zip

PNG

Async PNG encoding and merging
http://blog.inspirit.ru/?p=378
http://code.google.com/p/in-spirit/wiki/PNGEncoder
http://in-spirit.googlecode.com/files/PNGEncoder.swc.zip

BMP

Decoder
http://snippets.libspark.org/trac/wiki/munegon/BMPDecoder

Encoder
http://www.senocular.com/flash/actionscript/?file=ActionScript_3.0/com/senocular/images/BMPEncoder.as

TIFF

Encoder:
ActionScript 3 TIFF Encoder
http://blog.kevinhoyt.org/?p=319
http://blog.kevinhoyt.org/wp-content/tiff-encoder.zip

Decoder
http://www.ctyeung.com/AIR/index.html
http://code.google.com/p/windowsbitmapdencoder/downloads/list
http://windowsbitmapdencoder.googlecode.com/files/FileLoader_v_0_5_0.zip

ICO

Decoder
http://www.libspark.org/wiki/munegon/ICODecoder