Before there were graphical user interfaces, command-line interfaces were used to issue commands to a computer. Programs that handle the user interface are called command language interpreters, often known as a shell. A CLI may give a user more control over the computer and programs they wish to execute.
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Taskwarrior - Command line Task Management
CLI11 is a command line parser for C++11 and beyond that provides a rich feature set with a simple and intuitive interface.
Table Maker for Modern C++
Rhubarb Lip Sync is a command-line tool that automatically creates 2D mouth animation from voice recordings. You can use it for characters in computer games, in animated cartoons, or in any other project that requires animating mouths based on existing recordings.
Android File Transfer for Linux (and macOS!)
Argh! A minimalist argument handler.
Timewarrior - Commandline Time Tracking and Reporting
A library for interactive command line interfaces in modern C++
easy to use, powerful & expressive command line argument parsing for modern C++ / single header / usage & doc generation
Image metadata library and tools
slop (Select Operation) is an application that queries for a selection from the user and prints the region to stdout.
Free open-source modern C++17 / C++20 framework to create console, GUI (forms like WinForms) and unit test applications and libraries on Microsoft Windows, Apple macOS and Linux.
Alienware systems lights, fans, and power control tools and apps
A library to train, evaluate, interpret, and productionize decision forest models such as Random Forest and Gradient Boosted Decision Trees.
JSON processing utility