Open Source Software Downloads for Windows, Mac and Linux

What Open Source Software Actually Means

I've been reviewing PC software since 2013, and the phrase "open source software" still gets misused weekly in vendor press releases. It has a specific meaning: source code published under a licence approved by the OSI, with the right to read, modify and redistribute it. That's it. Price isn't part of the definition, which trips up readers who conflate it with our free software listings or our freemium catalogue.

Open source vs source-available vs freeware

Freeware costs nothing but hides its internals — fine for utilities, hopeless for anything touching your credentials. Source-available projects (BUSL, SSPL, Elastic Licence) publish code but restrict commercial reuse; useful, not technically open source. True FOSS lets a competitor fork the project tomorrow, which is exactly why it tends to outlive its corporate sponsors.

The libre software distinction

The Free Software Foundation prefers "libre" to stress freedom over price. In practice, "open source software" and "free software" describe the same code; the argument is philosophical. I use both terms interchangeably and so does most of the industry, Stallman's protests notwithstanding.

Licence Taxonomy: GPL, MIT and Apache 2.0

The licence determines what you can do with the code, and more importantly what downstream developers can do. Get this wrong in a commercial project and you'll find out via a solicitor's letter.

Copyleft: the GPL family

GPLv2 and GPLv3 are viral. If you ship a binary built on GPL code, you must ship the source under the same terms. Multimedia tools like VLC (LGPL/GPL) and Audacity sit here, as does the Linux kernel itself. Copyleft is why we still have a functioning open source ecosystem — it stops vendors from quietly enclosing the commons.

Permissive: MIT and Apache 2.0

MIT is twenty lines long and lets anyone do almost anything, including closing the source in a derivative product. Apache 2.0 adds patent grants, which matters for corporate adoption. Most modern developer tooling ships under one of these — React, Kubernetes, VS Code's open core. Permissive licences win on adoption; copyleft wins on long-term freedom.

Security: The xz-utils Reality Check

The standard pitch is that open source software is more secure because anyone can audit it. I've repeated this line for years and I'm now less certain. In March 2024, a maintainer called "Jia Tan" spent two years gaining trust on the xz-utils project before slipping in an SSH backdoor that nearly reached every Debian and Red Hat server on the planet. It was caught by accident, by one Microsoft engineer noticing a 500ms login delay.

What audit-friendliness actually buys you

Open source isn't automatically more secure — it's more auditable. That distinction matters. Security tools like KeePassXC and Bitwarden benefit because cryptographers can and do read the code. Random GitHub releases from a single maintainer with no review process benefit far less.

How I vet FOSS before listing it

I check three things: signed releases (GPG or Sigstore), more than one active maintainer in the last twelve months, and reproducible builds where the project claims them. If a download only exists as a binary on a personal Dropbox, it doesn't get listed. Our editorial methodology spells out the rest.

Open Source Across Platforms

FOSS started on Unix and it shows. Linux gets first-class treatment; everything else is a port of varying quality.

Linux, Windows and Mac

On Linux, your package manager already has most of what you need. On Windows, you're pulling MSIs from GitHub releases or using winget. On Mac, Homebrew handles 90% of the catalogue; the rest comes as unsigned DMGs that macOS will refuse to open until you right-click. Flatpak has made cross-distro Linux distribution sane for the first time in a decade.

FOSS Programs Worth Installing

The shortlist I actually run: LibreOffice on the work box (office productivity done properly, no Copilot nagware), KeePassXC for credentials, qBittorrent because the original uTorrent went to seed years ago, OBS Studio for screen capture, Inkscape and GIMP for graphics, Blender for 3D, Firefox as the daily browser, and Thunderbird for email. For games and entertainment, RetroArch and 0 A.D. earn their place. Bitwarden sits in the awkward middle — open source core with a paid org tier, which we treat as freemium with an OSS heart.