Command-line tools: O

• oasdiff

  OpenAPI Diff and Breaking Changes

• oath-toolkit

  Tools for one-time password authentication systems

• oauth2_proxy

  Reverse proxy for authenticating users via OAuth 2 providers

• oauth2l

  Simple CLI for interacting with Google oauth tokens

• obfs4proxy

  Pluggable transport proxy for Tor, implementing obfs4

• ocaml

  General purpose programming language in the ML family

• oci-cli

  Oracle Cloud Infrastructure CLI

• ocicl

  OCI-based ASDF system distribution and management tool for Common Lisp

• ocm

  CLI for the Red Hat OpenShift Cluster Manager

• ocp

  UNIX port of the Open Cubic Player

• ocrmypdf

  Adds an OCR text layer to scanned PDF files

• octave

  High-level interpreted language for numerical computing

• odin

  Programming language with focus on simplicity, performance and modern systems

• officecli

  Read, edit, and automate Office documents (.docx, .xlsx, .pptx)

• offlineimap

  Synchronizes emails between two repositories

• oh-my-agent

  Portable multi-agent harness for .agents-based skills and workflows

• oh-my-posh

  Prompt theme engine for any shell

• oha

  HTTP load generator, inspired by rakyll/hey with tui animation

• okta-aws-cli

  Okta federated identity for AWS CLI

• okta-awscli

  Okta authentication for awscli

• okteto

  Build better apps by developing and testing code directly in Kubernetes

• ola

  Open Lighting Architecture for lighting control information

• ollama

  Create, run, and share large language models (LLMs)

• ols

  Language server for The Odin Programming Language

• onedrive-cli

  Folder synchronization with OneDrive

• onefetch

  Command-line Git information tool

• oniguruma

  Regular expressions library

• onnx

  Open standard for machine learning interoperability

• onnxruntime

  Cross-platform, high performance scoring engine for ML models

• opa

  Open source, general-purpose policy engine

• opam

  OCaml package manager

• open-babel

  Chemical toolbox

• open-code-review

  AI-powered code review tool with deterministic pipelines and an LLM agent

• open-mpi

  High performance message passing library

• open-ocd

  On-chip debugging, in-system programming and boundary-scan testing

• open-scene-graph

  3D graphics toolkit

• openai-whisper

  General-purpose speech recognition model

• openal-soft

  Implementation of the OpenAL 3D audio API

• openapi

  CLI tools for working with OpenAPI, Arazzo and Overlay specifications

• openapi-generator

  Generate clients, server & docs from an OpenAPI spec (v2, v3)

• openbao

  Provides a software solution to manage, store, and distribute sensitive data

• openblas

  Optimized BLAS library

• opencascade

  3D modeling and numerical simulation software for CAD/CAM/CAE

• opencc

  Simplified-traditional Chinese conversion tool

• opencl-headers

  C language header files for the OpenCL API

• openclaw-cli

  Your own personal AI assistant

• opencode

  AI coding agent, built for the terminal

• opencolorio

  Color management solution geared towards motion picture production

• openconnect

  Open client for Cisco AnyConnect VPN

• opencore-amr

  Audio codecs extracted from Android open source project

• opencv

  Open source computer vision library

• opendht

  C++17 Distributed Hash Table implementation

• openexr

  High dynamic-range image file format

• openfga

  High performance and flexible authorization/permission engine

• openfortivpn

  Open Fortinet client for PPP+TLS VPN tunnel services

• openfpgaloader

  Universal utility for programming FPGA

• openfst

  Library for weighted finite-state transducers

• openh264

  H.264 codec from Cisco

• openimageio

  Library for reading, processing and writing images

• openjdk

  Development kit for the Java programming language

• openjdk@17

  Development kit for the Java programming language

• openjdk@21

  Development kit for the Java programming language

• openjdk@25

  Development kit for the Java programming language

• openjpeg

  Library for JPEG-2000 image manipulation

• openjph

  Open-source implementation of JPEG2000 Part-15 (or JPH or HTJ2K)

• openldap

  Open source suite of directory software

• openlist

  New AList fork addressing anti-trust issues

• openmotif

  LGPL release of the Motif toolkit

• openrtsp

  Command-line RTSP client

• opensc

  Tools and libraries for smart cards

• opensearch

  Open source distributed and RESTful search engine

• openshift-cli

  OpenShift command-line interface tools

• openslide

  C library to read whole-slide images (a.k.a. virtual slides)

• openspec

  Spec-driven development (SDD) for AI coding assistants

• openssh

  OpenBSD freely-licensed SSH connectivity tools

• openssl@3

  Cryptography and SSL/TLS Toolkit

• openssl@4

  Cryptography and SSL/TLS Toolkit

• openstackclient

  Command-line client for OpenStack

• opentelemetry-cpp

  OpenTelemetry C++ Client

• opentofu

  Drop-in replacement for Terraform. Infrastructure as Code Tool

• openvdb

  Sparse volumetric data processing toolkit

• openvino

  Open Visual Inference And Optimization toolkit for AI inference

• openvpn

  SSL/TLS VPN implementing OSI layer 2 or 3 secure network extension

• operator-sdk

  SDK for building Kubernetes applications

• opkssh

  Enables SSH to be used with OpenID Connect

• optipng

  PNG file optimizer

• opus

  Audio codec

• opus-tools

  Utilities to encode, inspect, and decode .opus files

• opusfile

  API for decoding and seeking in .opus files

• or-tools

  Google's Operations Research tools

• oras

  OCI Registry As Storage

• orc

  Oil Runtime Compiler (ORC)

• organize-tool

  File management automation tool

• ormolu

  Formatter for Haskell source code

• orocos-kdl

  Orocos Kinematics and Dynamics C++ library

• ortp

  Real-time transport protocol (RTP, RFC3550) library

• osc

  Command-line interface to work with an Open Build Service

• osm-gps-map

  GTK+ library to embed OpenStreetMap maps

• osm2pgrouting

  Import OSM data into pgRouting database

• osm2pgsql

  OpenStreetMap data to PostgreSQL converter

• osmium-tool

  Libosmium-based command-line tool for processing OpenStreetMap data

• osrm-backend

  High performance routing engine

• osslsigncode

  OpenSSL based Authenticode signing for PE/MSI/Java CAB files

• ossp-uuid

  ISO-C API and CLI for generating UUIDs

• osv-scanner

  Vulnerability scanner which uses the OSV database

• osx-cpu-temp

  Outputs current CPU temperature for OSX

• otel-cli

  Tool for sending events from shell scripts & similar environments

• oterm

  Terminal client for Ollama

• otree

  Command-line tool to view objects (JSON/YAML/TOML) in TUI tree widget

• ouch

  Painless compression and decompression for your terminal

• ov

  Feature-rich terminal-based text viewer

• overmind

  Process manager for Procfile-based applications and tmux

• oxen

  Data VCS for structured and unstructured machine learning datasets

• oxfmt

  High-performance formatting tool for JavaScript and TypeScript

• oxipng

  Multithreaded PNG optimizer written in Rust

• oxker

  Terminal User Interface (TUI) to view & control docker containers

• oxlint

  High-performance linter for JavaScript and TypeScript written in Rust

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