9 Free Open Source Alternatives to Paid Productivity Apps

While mainstream productivity apps have their advantages, ditching subscriptions doesn't mean you have to sacrifice features. Open source options offer flexibility, control, and all the features you need—without the cost.

9. Nextcloud

Nextcloud is a self-hosted cloud storage and file sharing solution that gives you complete control over your data. An open source alternative to OneDrive , Google Drive , and Dropbox , Nextcloud can be self-hosted on a home NAS (Network Attached Storage) or deployed in the cloud using third-party hosting services.

9 Free Open Source Alternatives to Paid Productivity Apps
View Nextcloud files on Raspberry Pi

8. Thunderbird

Thunderbird is a simple email client that can manage multiple email accounts. What makes it unique is its support for extensions. It is an open source, cross-platform email client with a great spam filtering system that uses your address book or server-based spam filters like SpamAssassin to detect spam.

9 Free Open Source Alternatives to Paid Productivity Apps
Thunderbird interface with email openThunderbird

7. Zotero

Whether you're a writer, student, or journalist, Zotero makes it easy to collect and organize your research and references. It also offers Word and Google Doc integration for easy citation management.

You can add citations using the desktop app, mobile app, or browser extension (Zotero Connector). This extension makes it easy to add citations directly from your web browser and capture screenshots for reference.

9 Free Open Source Alternatives to Paid Productivity Apps
Zotero's main interface displays a list of references.

6. Joplin

Joplin is an open source option for a neat note-taking app that stores notes locally on your device's storage. With features like a web clipper that lets you save web pages and screenshots from your web browser, it's a great free alternative to Evernote.

As a cross-platform utility, Joplin syncs across multiple devices via third-party cloud services like Nextcloud, OneDrive, or Dropbox, all protected by end-to-end encryption. Its clean interface and Markdown support make it an ideal note-taking app for those who prefer a quick, minimalist writing experience over complex text formatting. However, the app also offers a variety of text editor options for further customization.

9 Free Open Source Alternatives to Paid Productivity Apps
Joplin welcome screen with notes open for editing

5. Cal.com

Cal.com is a powerful meeting scheduling tool and an alternative to popular paid calendar tools like Calendly. As an open source tool, you can host it yourself and use it for free or opt for a hosted solution provided by Cal.com.

9 Free Open Source Alternatives to Paid Productivity Apps
Cal.com interface with Event tab selected, showing list of scheduled events

4. Screenness

If you like Loom, you'll definitely like Screenity - an open-source screen recording extension for Chromium-based browsers like Google Chrome , Edge, etc. It lets you record your screen with the camera without any limitations and provides annotation tools to add text, arrows, shapes, etc. to your recording. It also supports AI camera backgrounds to enhance your videos.

9 Free Open Source Alternatives to Paid Productivity Apps
Screenity interface displays recorded screen with annotation tools

3. ShareX

If Screenity excels in screen recording, ShareX is a widely used tool for taking screenshots on Windows. This tool is highly customizable, has many useful features, and is completely free.

9 Free Open Source Alternatives to Paid Productivity Apps
ShareX interface with screenshots and open right-click menu

Additionally, you can configure to automatically upload screenshots directly to your favorite cloud service.

2. OnlyOffice

Microsoft Office dominates the office suite space and for good reason, but if you're looking for a free, open source alternative, OnlyOffice is a great choice.

9 Free Open Source Alternatives to Paid Productivity Apps

With an interface that closely resembles Microsoft Office, OnlyOffice makes it a seamless transition from Microsoft's suite of applications to this suite. It supports all Office file formats and includes real-time collaboration tools, allowing teams to work together on documents with ease.

1. WeKan

If you like Kanban boards, WeKan is an open source tool for visual task management. You can create boards, lists, and cards to organize your workflow. Each task can be moved between lists to change its status ( To-Do > In Progress > Done ).

You can also set deadlines, add labels for better categorization, assign tasks to team members, and even attach files or comments for better collaboration. Since it is self-hosted, WeKan offers more privacy, making it an alternative project management platform for those who want more control over their system.

9 Free Open Source Alternatives to Paid Productivity Apps
WebKan Interface with Kanboard openWeKan
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