Letter J
jumpnbump: Cute multiplayer network game with bunnies
jigdo: Tool for distributing large files
jamboree: Music player
jpegpixi: JPEG pixel interpolator
john: John the Ripper password cracker
j2re: Sun Java(tm) 2 Runtime Environment
js: JavaScript interpreter
js: JavaScript interpreter
judy: Library which provides fully dynamic arrays
jailkit: Utilities to limit user accounts to specific files using chroot()
jungledisk: Store files and backup data securely to Amazon.com's S3 Storage Service
jabberoo: Library implementing the Jabber instant messaging system
jhead: Tool for handling EXIF metadata in JPEG image files