IcoFX - IcoFX is an all-in-one solution for icon creation, extraction and editing.
IconsExtract - Extract icons and cursors stored in EXE, DLL, OCX, CPL files
png2ico.com - Fully featured free online PNG, JPG, TIF, BMP & GIF etc. to ICO converter from sohOpen.
IconLover - Icon editor for Windows.
Online Favicon Generator & Gallery - Online favicon generator & creator provides to convert image GIF, JPEG, PNG and download in favicon.ico format 16x16 or 32x32 pixels or HTML code. This website also has a fantastic favicon gallery with download.
JDraw - Open Source SF.net