Best Open Source Tools Every Developer Should Know
Open source software powers most of the modern internet. From the servers that host websites to the tools developers use to write code, open source projects form the foundation of the entire software industry. Many of these tools are not just free alternatives to paid software. They are the best tools available, period. Here are some of the most important open source tools worth knowing.
Visual Studio Code
VS Code is a free, open source code editor built by Microsoft and released in 2015. It became the most popular code editor in the world within a few years of launch. Its success comes from a combination of fast performance, an enormous extension marketplace, built-in Git integration, IntelliSense code completion, and a highly customizable interface. Over seventy percent of developers in the Stack Overflow survey use VS Code as their primary editor. It supports virtually every programming language and development workflow.
Linux
Linux is the open source operating system kernel that powers the majority of the world's servers, all Android devices, most supercomputers, and a growing number of personal computers. Created by Linus Torvalds in 1991, Linux has become the most widely deployed operating system in history by scale. Distributions like Ubuntu, Debian, Fedora, and Arch give users different packaged versions of the Linux kernel combined with various software stacks. For developers, running Linux means working directly in the same environment your code will run in production.
Git
Git is the version control system that the entire software industry runs on. Created by Linus Torvalds in 2005 to manage the Linux kernel codebase, Git tracks changes to files over time, allows multiple developers to work on the same project simultaneously, and makes it possible to roll back to any previous state of a codebase. GitHub and GitLab are built on top of Git. Every serious software project uses Git. It is not optional knowledge for anyone writing code professionally.
PostgreSQL
PostgreSQL is one of the most powerful open source relational databases in existence. It has been in active development since 1986 and supports advanced features like JSON storage, full-text search, window functions, and complex indexing strategies that rival or exceed commercial databases costing tens of thousands of dollars. Developers and companies choose PostgreSQL over paid alternatives like Oracle not just because it is free, but because it is genuinely excellent. It handles everything from small personal projects to massive production systems at companies like Instagram and Spotify.
Docker
Docker is an open source platform for building and running applications inside containers. Containers package an application with all its dependencies into a single portable unit that runs consistently across any environment. Before Docker, the phrase works on my machine was one of the most common complaints in software development. Docker made it possible to define an environment precisely and replicate it exactly from a developer laptop to a production server. It is now a fundamental part of modern DevOps and cloud deployment workflows.
VLC Media Player
VLC is the open source media player that plays virtually every audio and video format ever created. It is free, lightweight, available on every major operating system, and has never asked you to pay for a codec. It streams video from the internet, plays DVDs, handles damaged files that other players cannot open, and converts between formats. VLC is one of the most downloaded software programs in history and a perfect example of open source software that is simply the best tool for its job by any measure.
Firefox
Firefox is the open source web browser developed by the Mozilla Foundation. It is the only major browser engine not controlled by a large tech corporation. While Chrome dominates market share, Firefox remains critically important for web standards, privacy, and developer tooling. Firefox DevTools are excellent, and the browser includes strong privacy protections by default. Supporting Firefox means supporting a more diverse and competitive browser ecosystem, which is good for the entire web.
