12 Must-Have Open‑Source Tools Every Developer Should Use

Developers can greatly enhance productivity by leveraging a selection of open‑source tools that cover IDEs, API testing, backend services, command‑line utilities, AI model execution, and DevOps orchestration.

Theia

Theia is a flexible, cloud‑and‑desktop IDE built with TypeScript, offering an extensible plugin system compatible with VSCode extensions and multi‑language support.

Cloud and desktop IDE features

Extensible plugin system (VSCode compatible)

Multi‑language support

Website: https://theia-ide.org/

GitHub: https://github.com/eclipse-theia/theia

Postman

Postman lets you chain requests, automate tasks, and collaborate on APIs, providing a user‑friendly alternative to cURL.

API testing and automation

Request chaining for complex workflows

Team collaboration tools

Website: https://www.postman.com/

GitHub: https://github.com/postmanlabs/postman-app-support

Hoppscotch

Hoppscotch is a free, lightweight, and visually appealing API request builder that supports HTTP methods, built‑in GraphQL, and environment variables.

Supports GET, POST, PUT, DELETE, PATCH, etc.

Built‑in GraphQL support

Collection management and environment variables

Website: https://hoppscotch.io/

GitHub: https://github.com/hoppscotch/hoppscotch

Pocketbase

Pocketbase is an open‑source real‑time backend written in Go, offering an embedded SQLite database, file and user management, and a simple REST‑ish API for Flutter, Vue, React, and Angular apps.

Embedded SQLite with real‑time subscriptions

Built‑in file and user management

Simple REST‑ish API

Website: https://pocketbase.io/

GitHub: https://github.com/pocketbase/pocketbase

cURL

cURL is a ubiquitous command‑line tool for invoking APIs, supporting multiple protocols and scriptable usage across Linux, macOS, and other platforms.

Supports HTTP, FTP, and many other protocols

Scriptable command‑line interface

Website: https://curl.se/

GitHub: https://github.com/curl/curl

Waveterm

Waveterm is an open‑source AI‑native terminal that combines command‑line operations with networked sessions, searchable history, an inline VSCode‑like editor, and ChatGPT integration for command assistance.

Session persistence across network interruptions

Searchable contextual command history

CodeEdit: inline editor for local and remote files

AI integration with ChatGPT‑compatible APIs

Website: https://www.waveterm.dev/

GitHub: https://github.com/wavetermdev/waveterm

Ollama

Ollama enables local experimentation with large language models (LLMs), offering a Docker‑Desktop‑like experience for running and testing models on the developer’s machine.

Local LLM testing

Development environment for large models

OpenAI‑compatible API

Website: https://ollama.com/

GitHub: https://github.com/ollama/ollama

LM Studio

LM Studio is a competitor to Ollama, providing local LLM testing, OpenAI‑compatible APIs, and native support for Windows PCs.

Local LLM testing

OpenAI‑compatible API

Windows support

Website: https://lmstudio.ai/

GitHub: https://github.com/lmstudio-ai

VS Code

VS Code is a widely adopted open‑source code editor with an extensive extension ecosystem, offering extensibility, debugging support, and a rich plugin marketplace.

Highly extensible code editor

Integrated debugging

Vast extension ecosystem

Website: https://code.visualstudio.com/

GitHub: https://github.com/microsoft/vscode

Docker Compose

Docker Compose simplifies the definition and management of multi‑container Docker applications using a single compose.yaml file.

Container orchestration

Service definition via YAML

Multi‑container application management

Website: https://docs.docker.com/compose/

GitHub: https://github.com/docker/compose

ESLint

ESLint is a powerful linting tool for JavaScript and TypeScript, offering configurable rules, plugins, and integration with Prettier to improve code quality.

Code quality analysis

Configurable linting rules

Support for JavaScript and TypeScript

Website: https://eslint.org/

GitHub: https://github.com/eslint/eslint

Oh My Zsh

Oh My Zsh enhances the Zsh shell with customizable themes, plugins, and community‑driven development, making terminal workflows more pleasant.

Zsh configuration management

Customizable themes and plugins

Community‑driven development

Website: https://ohmyz.sh/

GitHub: https://github.com/ohmyzsh/ohmyzsh

These twelve open‑source tools span IDEs, API clients, backend services, command‑line utilities, AI model platforms, and DevOps solutions, offering developers a robust toolbox to boost efficiency and streamline their workflows.