ResFork is a modern resource editor, which was developed originally for Mac OS and ported to Mac OS X. It is based on Carbon APIs and therefore needs CarbonLib. Nowadays a version regarding Mac OS is available but this one isn't supported and only a spin-off product of Mac OS X development.
Native editor with hex- and ASCII-view.
ResFork is Freeware.
Supports multitasking and multithreading.
Editors for "TEXT", "PICT", "hfdr" (experimental) and file info
German and English Languages are supported.
Sourcecode available for free (under LGPL).
At present no full support for "TMPL" resources is available (planned for version 1.1)!
It will never be huge and slow.