jmeter
Monitoring
Load testing and performance measurement application
jnettop
Network & VPN
View hosts/ports taking up the most network traffic
jobber
Development
Alternative to cron, with better status-reporting and error-handling
johnnydep
Development
Display dependency tree of Python distribution
joshuto
File Managers
Ranger-like terminal file manager written in Rust
jove
Text Editors
Emacs-style editor with vi-like memory, CPU, and size requirements
joyce
Development
Emulates the Amstrad PCW on Unix, Windows and macOS
jpdfbookmarks
PDF Tools
Create and edit bookmarks on existing PDF files
jpeg-archive
Archivers
Utilities for archiving JPEGs for long term storage
jpeg-xl
Archivers
New file format for still image compression
jpeginfo
Development
Prints information and tests integrity of JPEG/JFIF files
jrsonnet
Development
Rust implementation of Jsonnet language