Command-line tools: J

• jack

  Audio Connection Kit

• jadx

  Dex to Java decompiler

• jags

  Just Another Gibbs Sampler for Bayesian MCMC simulation

• janet

  Dynamic language and bytecode vm

• jansson

  C library for encoding, decoding, and manipulating JSON

• jaq

  JQ clone focussed on correctness, speed, and simplicity

• jasper

  Library for manipulating JPEG-2000 images

• javacc

  Parser generator for use with Java applications

• jbang

  Tool to create, edit and run self-contained source-only Java programs

• jbig2enc

  JBIG2 encoder (for monochrome documents)

• jc

  Serializes the output of command-line tools to structured JSON output

• jcode

  AI coding agent harness for the terminal

• jd

  JSON diff and patch

• jdtls

  Java language specific implementation of the Language Server Protocol

• jdupes

  Duplicate file finder and an enhanced fork of 'fdupes'

• jemalloc

  Implementation of malloc emphasizing fragmentation avoidance

• jenkins

  Extendable open source continuous integration server

• jenkins-lts

  Extendable open source continuous integration server

• jenv

  Manage your Java environment

• jetty

  Java servlet engine and webserver

• jfrog-cli

  Command-line interface for JFrog products

• jhipster

  Generate, develop and deploy Spring Boot + Angular/React applications

• jid

  Json incremental digger

• jinja2-cli

  CLI for the Jinja2 templating language

• jira-cli

  Feature-rich interactive Jira CLI

• jiratui

  Textual User Interface for interacting with Atlassian Jira from your shell

• jj

  Git-compatible distributed version control system

• jjui

  TUI for interacting with the Jujutsu version control system

• jless

  Command-line pager for JSON data

• jmeter

  Load testing and performance measurement application

• jnv

  Interactive JSON filter using jq

• jo

  JSON output from a shell

• joe

  Full featured terminal-based screen editor

• joern

  Open-source code analysis platform based on code property graphs

• john

  Featureful UNIX password cracker

• john-jumbo

  Enhanced version of john, a UNIX password cracker

• joplin-cli

  Note taking and to-do application with synchronization capabilities

• jp2a

  Convert JPG images to ASCII

• jpeg

  Image manipulation library

• jpeg-turbo

  JPEG image codec that aids compression and decompression

• jpeg-xl

  New file format for still image compression

• jpegoptim

  Utility to optimize JPEG files

• jq

  Lightweight and flexible command-line JSON processor

• jql

  JSON query language CLI tool

• jqp

  TUI playground to experiment and play with jq

• jrnl

  Command-line note taker

• jruby

  Ruby implementation in pure Java

• js-beautify

  JavaScript, CSS and HTML unobfuscator and beautifier

• jscpd

  Copy/paste detector for programming source code

• jsign

  Tool for signing Windows executable files, installers and scripts

• json-c

  JSON parser for C

• json-glib

  Library for JSON, based on GLib

• jsoncpp

  Library for interacting with JSON

• jsongrep

  Query tool for JSON, YAML, TOML, and other structured formats

• jsonlint

  JSON parser and validator with a CLI

• jsonnet

  Domain specific configuration language for defining JSON data

• jsonnet-bundler

  Package manager for Jsonnet

• jsonpp

  Command-line JSON pretty-printer

• juicefs

  Cloud-based, distributed POSIX file system built on top of Redis and S3

• juju

  DevOps management tool

• julia

  Fast, Dynamic Programming Language

• juliaup

  Julia installer and version multiplexer

• jump

  Helps you navigate your file system faster by learning your habits

• jupyterlab

  Interactive environments for writing and running code

• jupytext

  Jupyter notebooks as Markdown documents, Julia, Python or R scripts

• just

  Handy way to save and run project-specific commands

• just-lsp

  Language server for just

• jwt-cli

  Super fast CLI tool to decode and encode JWTs built in Rust

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