Best Free Open Source Software for PC & Mac You Shouldn’t Miss

What Makes Open Source Software Special?

Before diving into the specific applications, it’s worth understanding why open source software has become such a compelling choice. Open source programs provide complete transparency – their source code is freely available for anyone to inspect, modify, and improve. This collaborative approach often results in more secure, stable and innovative software than proprietary alternatives.

The community-driven development model means these applications are constantly evolving, with passionate developers worldwide contributing improvements and bug fixes. Plus, there’s no vendor lock-in – you’re free to use, modify, and distribute the software as you need.

Office Productivity & Document Creation

LibreOffice: The Complete Office Suite

LibreOffice stands as the most comprehensive free alternative to Microsoft Office. This mature office suite includes Writer (word processing), Calc (spreadsheets), Impress (presentations), Draw (vector graphics), Base (database), and Math (equation editor).

What it replaces: Microsoft Office (costs $99-149/year)
Available for: Windows, macOS, Linux, Android, iOS
Download: https://www.libreoffice.org

LibreOffice excels in document compatibility and offers extensive customization options. It supports over 119 languages and provides deep scripting capabilities. The software handles Microsoft Office formats well, though complex documents might occasionally need minor formatting adjustments.

OnlyOffice: Microsoft Office Compatibility Champion

For users who prioritize maximum compatibility with Microsoft Office files, OnlyOffice presents a compelling alternative. Built around the OOXML format, it promises near-perfect fidelity when working with DOCX, XLSX, and PPTX files.

What it replaces: Microsoft Office
Available for: Windows, macOS, Linux, Web, Android, iOS
Download: https://www.onlyoffice.com

OnlyOffice offers a modern, familiar interface that closely resembles Microsoft Office. It includes real-time collaboration features, making it excellent for team environments. The software provides both free desktop applications and a hosted cloud service. Another similar free suite is Open Office.

Web Browsing & Internet Security

Firefox: The Privacy-Focused Browser

Mozilla Firefox remains the gold standard for open source web browsing. This veteran browser has evolved significantly, offering robust privacy protections, extensive customization options, and strong security features.

What it replaces: Chrome, Safari, Edge
Available for: Windows, macOS, Linux, Android, iOS
Download: https://www.mozilla.org/firefox

Firefox pioneered many privacy features that have become standard, including tracker blocking and cookie management. Its open source nature means security experts worldwide can audit the code, ensuring transparency in how your data is handled.

Brave: The Crypto-Enabled Privacy Browser

Brave Browser has emerged as a powerful alternative that blocks ads and trackers by default. Built on Chromium, it offers familiar Chrome-like functionality while prioritizing user privacy and even includes cryptocurrency earning features.

What it replaces: Chrome, Safari, Edge
Available for: Windows, macOS, Linux, Android, iOS
Download: https://brave.com

Brave’s standout feature is its built-in ad blocking, which not only protects privacy but also significantly improves page loading speeds. The browser includes Tor integration for enhanced anonymity and offers Basic Attention Token (BAT) rewards for viewing privacy-respecting ads.

Media & Entertainment

VLC Media Player: The Universal Media Player

Once upon a time there was Winamp. Now, VLC has earned its reputation as the Swiss Army knife of media players. This versatile application plays virtually any audio or video format you throw at it, making it an essential tool for anyone working with multimedia content.

What it replaces: Windows Media Player, QuickTime Player, paid media players
Available for: Windows, macOS, Linux, Android, iOS, and more
Download: https://www.videolan.org/vlc

Beyond basic playback, VLC offers advanced features like media conversion, streaming capabilities, and even basic video editing. It handles corrupted files better than most alternatives and doesn’t require additional codec downloads.

SMPlayer: The Feature-Rich Alternative

SMPlayer provides another excellent open source media player option, built on the powerful MPlayer engine. It offers a clean interface with advanced playback controls and supports a wide range of formats.

What it replaces: Windows Media Player, other media players
Available for: Windows, Linux
Download: https://www.smplayer.info

Audio Production & Editing

Audacity: The Audio Editor for Everyone

Audacity has been the go-to free audio editor for over two decades. This mature application provides comprehensive audio recording, editing, and processing capabilities that satisfy both beginners and professionals.

What it replaces: Adobe Audition (costs $20.99/month), other paid audio editors
Available for: Windows, macOS, Linux
Download: https://www.audacityteam.org

Audacity supports multi-track editing, a vast array of effects, and can handle most audio formats. Its extensive plugin ecosystem allows users to add functionality for specialized tasks, from noise reduction to advanced audio analysis.

Mixxx: Professional DJ Software

For aspiring and professional DJs, Mixxx offers a completely free, open source solution with professional-grade features. This software supports DJ controllers, includes comprehensive mixing tools, and even provides Digital Vinyl System (DVS) support.

What it replaces: Serato DJ Pro, Traktor Pro (cost $99-299)
Available for: Windows, macOS, Linux
Download: https://mixxx.org

Mixxx’s strength lies in its extensive controller compatibility and mapping system. You can customize any MIDI controller to work with the software, making it incredibly flexible for different DJ setups.

Graphics & Design

GIMP: Advanced Image Editing

The GNU Image Manipulation Program (GIMP) stands as the most powerful free alternative to Adobe Photoshop. While it has a steeper learning curve than some alternatives, GIMP provides professional-grade image editing capabilities.

What it replaces: Adobe Photoshop (costs $20.99/month)
Available for: Windows, macOS, Linux
Download: https://www.gimp.org

GIMP supports layers, advanced selection tools, color correction, and extensive plugin support. Professional photographers and graphic designers worldwide rely on GIMP for serious image editing work.

Inkscape: Vector Graphics Excellence

For vector graphics creation, Inkscape provides a comprehensive alternative to Adobe Illustrator. This software excels at creating logos, illustrations, and scalable graphics using the SVG format.

What it replaces: Adobe Illustrator (costs $20.99/month)
Available for: Windows, macOS, Linux
Download: https://inkscape.org

Inkscape’s strength lies in its professional vector editing tools and excellent SVG support. It’s particularly popular among web designers who need to create scalable graphics for responsive websites.

Krita: Digital Painting Powerhouse

Krita has carved out a special niche as the premier free digital painting application. Created by artists for artists, it focuses specifically on digital painting and illustration rather than photo editing.

What it replaces: Adobe Photoshop (for painting), Corel Painter
Available for: Windows, macOS, Linux, Android
Download: https://krita.org

Krita’s extensive brush engines and painting-focused interface make it ideal for concept artists, illustrators, and anyone interested in digital art. The software includes animation capabilities and supports graphics tablets out of the box.

Video Editing & Production

Kdenlive: Professional Video Editing

Kdenlive has emerged as one of the most capable open source video editors available. This non-linear editor provides a professional multi-track interface suitable for both basic projects and complex video production.

What it replaces: Adobe Premiere Pro (costs $20.99/month), Final Cut Pro (costs $299)
Available for: Windows, macOS, Linux
Download: https://kdenlive.org

Kdenlive offers unlimited audio and video tracks, keyframeable effects, proxy editing for performance, and comprehensive format support. Its customizable interface and powerful features make it suitable for YouTube creators and professional video editors alike.

Blender: The Complete 3D Creation Suite

While primarily known as a 3D modeling and animation application, Blender also includes a surprisingly capable video editor. This makes it a unique all-in-one solution for content creators working with both 2D and 3D materials.

What it replaces: Maya, 3ds Max, Cinema 4D (cost $1,000+/year)
Available for: Windows, macOS, Linux
Download: https://www.blender.org

Blender’s video editor supports multi-track editing, real-time preview, and integrates seamlessly with the 3D workspace. For creators who work with motion graphics or 3D content, this integration is invaluable.

DaVinci Resolve: Hollywood-Grade Color Correction

While not technically open source, DaVinci Resolve deserves mention as a completely free professional video editor used in Hollywood productions. The free version includes nearly all features of the paid Studio version.

What it replaces: Adobe Premiere Pro, Avid Media Composer
Available for: Windows, macOS, Linux
Download: https://www.blackmagicdesign.com/products/davinciresolve

File Management & Transfer

FileZilla: FTP Client Standard

FileZilla has maintained its position as the most popular open source FTP client for good reason. It provides a reliable, feature-rich solution for transferring files between computers and servers.

What it replaces: Paid FTP clients like CuteFTP
Available for: Windows, macOS, Linux
Download: https://filezilla-project.org

FileZilla supports FTP, FTPS, and SFTP protocols, offers a familiar dual-pane interface, and includes features like drag-and-drop transfers and site bookmarking.

7-Zip: Superior File Compression

7-Zip consistently delivers better compression ratios than WinRAR or WinZip while remaining completely free. This utility supports numerous archive formats and integrates seamlessly with Windows Explorer.

What it replaces: WinRAR (costs $29), WinZip (costs $30)
Available for: Windows, Linux (command line)
Download: https://www.7-zip.org

7-Zip’s native 7z format often achieves the best compression ratios available. The software also includes AES-256 encryption for securing sensitive archives.

Email & Communication

Thunderbird: Full-Featured Email Client

Mozilla Thunderbird provides a comprehensive open source email client that rivals any commercial alternative. This mature application handles multiple email accounts, includes calendar integration, and offers robust security features.

What it replaces: Microsoft Outlook (part of Office suite)
Available for: Windows, macOS, Linux
Download: https://www.thunderbird.net

Thunderbird excels at email organization with powerful filtering, tagging, and search capabilities. It supports PGP encryption, includes a feed reader, and offers extensive customization through add-ons. On mobile devices try also FairEmail app.

Security & Privacy Tools

Bitwarden: Password Management Made Simple

Bitwarden offers the most user-friendly open source password manager available. Unlike more technical alternatives, Bitwarden provides seamless synchronization across all devices while maintaining strong security.

What it replaces: 1Password (costs $36/year), LastPass Premium
Available for: Windows, macOS, Linux, Web, Android, iOS
Download: https://bitwarden.com

Bitwarden’s strength lies in its ease of use and cross-platform compatibility. The free version includes unlimited password storage and sync across devices, with paid plans adding advanced features like secure file sharing.

KeePass: Maximum Security Password Manager

For users who prioritize absolute security and control, KeePass provides an ultra-secure password management solution. This database-driven approach keeps all passwords stored locally in an encrypted file.

What it replaces: Commercial password managers
Available for: Windows, with community ports for other platforms
Download: https://keepass.info

KeePass requires more technical knowledge to set up synchronization between devices, but offers unmatched security and customization. Its plugin ecosystem allows extensive functionality expansion.

Project Management & Productivity

OpenProject: Comprehensive Project Management

OpenProject stands out as the most feature-complete open source project management solution. This platform combines traditional project management with agile methodologies and team collaboration tools.

What it replaces: Microsoft Project, Asana, Trello (various pricing)
Available for: Web-based, on-premises hosting
Download: https://www.openproject.org

OpenProject includes Gantt charts, Kanban boards, time tracking, and extensive reporting capabilities. The European-based company emphasizes data privacy and GDPR compliance, making it ideal for privacy-conscious organizations.

Taiga: Agile Project Management

For teams focused on agile development, Taiga provides a clean, intuitive interface designed specifically for agile workflows. This tool emphasizes simplicity while providing powerful project management features.

What it replaces: Jira, other agile tools
Available for: Web-based, on-premises
Download: https://taiga.io

Taiga’s strength lies in its user-friendly interface and focus on agile methodologies. It includes kanban boards, sprint planning, and team collaboration features without overwhelming complexity.

Installation Tips and Getting Started

When installing open source software like the ones listed above, always download recent stable versions from official websites to ensure you’re getting authentic, unmodified versions. Many of these applications are available through package managers on Linux systems, making installation and updates even more straightforward.

Start with one or two applications that address your most pressing needs. For example, if you’re paying for Microsoft Office, LibreOffice or OnlyOffice can provide immediate cost savings. If privacy is your concern, switching to Firefox or Brave can enhance your online security right away.

Most open source applications include comprehensive documentation and active community forums. Don’t hesitate to explore these resources – the open source community is generally welcoming and helpful to newcomers.

The Future of Open Source Software

The open source movement continues to gain momentum in 2025, with major corporations increasingly adopting and contributing to open source projects. This trend ensures that these free alternatives will continue improving and gaining features that rival or surpass their commercial counterparts.

Cloud integration, AI-powered features, and enhanced collaboration tools are becoming standard in open source applications. This means choosing open source today positions you well for future technological developments.

Making the Switch…

Transitioning to open source software doesn’t have to be an all-or-nothing proposition. You can gradually replace proprietary software as licenses expire or when you encounter limitations with your current tools. Many users find that starting with applications like VLC, Firefox, or 7-Zip provides an easy introduction to the open source ecosystem.

The key is to approach each application with an open mind. While interfaces might differ from what you’re accustomed to, the functionality is often comparable or superior. The time invested in learning these tools pays dividends through cost savings, enhanced privacy, and freedom from vendor lock-in.

Remember that choosing open source software means joining a global community of users and developers working together to create better tools for everyone. Your feedback, bug reports, and contributions (whether code, documentation, or simply spreading the word) help improve these applications for millions of users worldwide.

Nowadays, open source software has reached a level of maturity and capability that makes it a viable primary option rather than just an alternative. Whether you’re motivated by cost savings, privacy concerns, or simply want access to the most innovative software available, the open source ecosystem offers powerful solutions for virtually every computing need.

Beyond the software above, don’t forget open source OS (operative system) like Zorin, an excellent free alternative to Microsoft Windows and macOS, particularly valid to give new life to your old machines that are not supported by recent paid OS anymore. You can try it via USB stick before installing it.

Video: Open Source Explained by IBM