Missing a description of what it actually is.
http://jackforamigaos.wordpress.com/Multi purpose utility
Comprehensive AmigaOS App-Store
Quick access to AmigaOS Preferences
Screen snapshoter
Get the Most our of your Amiga. Jack now includes a plug-in for Assist by Daniel Hutchinson.
Fully-featured Image Editor, includes Batch-image processing
Speedy access to all your connected devices
Support for Push4Dock – quick access to your Documents, Images, Music and more…
JackTunes: Comprehensive music player for accessing your ITunes music collection. Beta version. Awaiting audio drivers for SAM 460 in order finish this extension.
Unique Slideshow mode for viewing your image directories
Handy Calculator, similar to Spotlight in Mac OS X, its there when you need it most
Thesaurus – Learn words in the English Language (requires WordNet).
Basic file-management, Make New Drawer, Delete, Rename and Add Comment
Open your files in Helper Applications
HTTP/HTTPS support for downloading files to a directory before Opening
Jack can be called entirely from the command line, in this mode it will act as a modern file requester that retains all the above features.
