this post was submitted on 02 Aug 2025
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We all love open-source software, but there are so many amazing projects out there that often go unnoticed. Let's change that! Share your favorite open-source software that you think more people should know about. Here’s how you can contribute:

  1. Single Option Per Comment: Mention one open-source software per comment to be able to easily find the most popular software.
  2. No Duplicates: Avoid duplicating software that has already been mentioned to ensure a wide variety of options.
  3. Upvote What You Love: If you see a software that you also appreciate, upvote it to help others discover it more easily.

Check out last year's post for more inspiration: Last Year's Post

Let's create a comprehensive list of open-source software that everyone should know about!

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[–] PumpkinDrama@reddthat.com 226 points 1 month ago* (last edited 1 month ago) (14 children)

Syncthing: Continuous, private, and encrypted file synchronization across multiple devices without using the cloud.

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[–] toothbrush@lemmy.blahaj.zone 167 points 1 month ago* (last edited 1 month ago) (27 children)

KDE Connect: An app for iOS, android, pretty much every flavor of linux, windows, etc. that lets you connect any devices together to share files, show notifications of other devices, use your phone as an input device(keyboard, mouse), control multimedia applications(start, play, stop, etc.), trigger commands, and everything else if you make a plugin for it.

[–] golden_zealot@lemmy.ml 27 points 1 month ago (2 children)

The craziest thing I discovered when I started using it was when I noticed that because my desktop was now connected to my phone and my phone was connected to my watch, I could completely control the media on both from my watch and the integration felt natural - but also something I haven't seen work that well in the proprietary world.

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[–] PumpkinDrama@reddthat.com 140 points 1 month ago* (last edited 1 month ago) (5 children)

KeePassXC: A modern, secure, open-source password manager that stores and manages sensitive information offline.

[–] paper_moon@lemmy.world 43 points 1 month ago (9 children)

Mixed with syncthing to sync your database file across your devices and its chef's kiss

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[–] Voroxpete@sh.itjust.works 98 points 1 month ago (10 children)

LocalSend should be called God Send because it'll save your life. It's AirDrop, but for everything and open source. Works really well, no setup, no server.

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[–] PumpkinDrama@reddthat.com 96 points 1 month ago* (last edited 1 month ago) (4 children)

Forgejo: A self-hosted, lightweight software forge offering Git repository hosting with an easy-to-install, low-maintenance platform focused on collaboration, federation, and privacy.

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[–] PumpkinDrama@reddthat.com 95 points 1 month ago* (last edited 1 month ago) (3 children)

Lichess: A popular free, open-source online chess platform offering play, puzzles, and tournaments.

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[–] LambdaRX@sh.itjust.works 87 points 1 month ago (4 children)

Newpipe, an YouTube client, which is:

  • ad free

  • lightweight

  • useful, it allows downloading videos, music, and playing them when screen is locked

  • usable without account

  • multi-platform, it can also serve as client for the PeerTube, Bandcamp, SoundCloud

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[–] PumpkinDrama@reddthat.com 80 points 1 month ago* (last edited 1 month ago) (7 children)

LibRedirect is an open-source browser extension for Firefox and Microsoft Edge that automatically redirects popular online services like YouTube, Twitter, Instagram, TikTok, Reddit, and others to privacy-friendly alternative websites, enhancing user privacy by avoiding trackers and data collection on the original platforms.

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[–] BagOfHeavyStones@piefed.social 77 points 1 month ago (3 children)

Rustdesk.

It's TeamViewer / AnyDesk without the headaches.

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[–] PumpkinDrama@reddthat.com 76 points 1 month ago* (last edited 1 month ago) (6 children)

Joplin: An open-source note-taking and to-do app with markdown support and end-to-end encryption.

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[–] Dreaming_Novaling@lemmy.zip 73 points 1 month ago* (last edited 1 month ago) (9 children)

Anki (and AnkiDroid):

The gods of learning and studying with flashcards. You will never want another flashcard program, especially if you were still using Quizlet (so enshittified now...) because Anki uses SRS (spaced repetition system) which makes you review things right before your brain forgets it to reinforce the subject material.

Add-ons: Bread and butter of Anki, I use several to make beautiful automatic flashcards of reading material/videos/games when I study Japanese. There's an add-on for literally anything.

Cross platform: Free on desktop, cost $25 on iOS, and free on Android, although Ankidroid is an unofficial app. Still great though!

Cloud: Syncs your anki database across devices. If you don't use anki for a while, will delete from the cloud, but as long as you have your own local database intact, you can reupload again later. (EDIT: Went through settings, you can self-host your own sync server!)

Sharing Decks: If you don't feel like making your own decks, download ones that others shared for free.

Anki is used by language learners, college students, med students, etc. If you need to memorize it, use Anki.

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[–] PumpkinDrama@reddthat.com 71 points 1 month ago (3 children)

tmux: A terminal multiplexer that enables managing multiple terminal sessions within a single window, allowing detaching and reattaching sessions to keep programs running in the background.

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[–] PumpkinDrama@reddthat.com 66 points 1 month ago* (last edited 1 month ago) (3 children)

Pandoc: A universal document converter allowing conversion among numerous markup formats including Markdown, LaTeX, HTML, and Word.

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[–] hard_zero1@discuss.tchncs.de 61 points 1 month ago (6 children)

OsmAnd, mobile app for navigation and maps. Offline, based on OSM, can do anything. I use it for checking out and bookmarking places, finding POIs and pubic transport stations, routing (especially for bike and foot), measuring distances, and so on. It can also show and record tracks, do car navigation, edit OSM points, and more stuff that I don't use. Pro/plus/full version free on FDroid

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[–] brisk@aussie.zone 58 points 1 month ago (4 children)

Zotero: a free and open-source reference management software to manage bibliographic data and related research materials, such as PDF and ePUB files.

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[–] apprehensively_human@lemmy.ca 56 points 1 month ago (3 children)

Immich is a photo/video hosting solution à la Google photos

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[–] a_person@piefed.social 55 points 1 month ago (3 children)

Shattered pixel dungeon. Open source dungeob crawler roguelike. Extremely fun.

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[–] PumpkinDrama@reddthat.com 52 points 1 month ago* (last edited 1 month ago) (1 children)

Typst: A modern typesetting system designed for easy document creation with markup inspired by Markdown but more powerful and programmable.

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[–] antrosapien@lemmy.ml 49 points 1 month ago (3 children)

rnote Rnote is an open-source vector-based drawing app for sketching, handwritten notes and to annotate documents and pictures. It is targeted at students, teachers and those who own a drawing tablet and provides features like Pdf and picture import and export, an infinite canvas and an adaptive UI for big and small screens.

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[–] hard_zero1@discuss.tchncs.de 49 points 1 month ago (3 children)

FairEmail, email app for Android that has every feature I can imagine. Available on FDroid

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[–] kazerniel@lemmy.world 48 points 1 month ago (1 children)

qBittorrent: only for your legal torrenting needs from e.g. archive.org :>

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[–] Kalcifer@sh.itjust.works 47 points 1 month ago* (last edited 1 month ago)

Lemmy ^[1]^

References

  1. Type: Website. Title: "Lemmy". Accessed: 2025-08-03T05:12Z. URI: https://join-lemmy.org/.
[–] Core_of_Arden@lemmy.ml 46 points 1 month ago* (last edited 1 month ago)

LibreOffice - simply the best office suite there is (IMHO). I was a MS-office user for years, but since I switched, I haven't looked back...

[–] TheOrionArm@lemmy.world 44 points 1 month ago

librewolf a privacy-focused fork of the latest stable firefox (win,linux,mac)

[–] gon@lemmy.dbzer0.com 44 points 1 month ago (1 children)
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[–] kazerniel@lemmy.world 43 points 1 month ago (2 children)
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[–] darkreader2636@lemmy.zip 43 points 1 month ago (3 children)

Copyparty turns almost any device into a file server with resumable uploads/downloads using any web browser

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[–] Core_of_Arden@lemmy.ml 42 points 1 month ago (6 children)

Inkscape - the best vector graphics program out there. So easy to use, and so powerful.

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[–] PumpkinDrama@reddthat.com 42 points 1 month ago* (last edited 1 month ago) (6 children)

Czkawka: A free, fast, and open-source tool for finding and removing duplicate files, cleaning empty folders, and optimizing storage by content-based file comparison across multiple platforms.

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[–] PumpkinDrama@reddthat.com 42 points 1 month ago* (last edited 1 month ago) (6 children)

PieFed: a link aggregator and forum platform built for the Fediverse, focusing on individual control, safety, decentralized power, and healthy community interactions, with features like reputation indicators and keyword filters to enhance user experience.

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[–] EvanescentWave@discuss.tchncs.de 41 points 1 month ago (3 children)

VLC (VideoLAN media player): play media files, DVDs, network streams and more. Just works,

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[–] commie@lemmy.dbzer0.com 41 points 1 month ago (2 children)

screen

a gnu until that let's you run a persistent session, even if you log off. log back in and reattach your screen and whatever you were doing is still running.

[–] treasure@feddit.org 26 points 1 month ago (2 children)
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[–] horseloaf@sh.itjust.works 38 points 1 month ago (5 children)

Tenacity - a pre-enshitification fork of Audacity. An audio recorder and editor that does multi-track recording, effects and much more in a really simple UI.

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[–] Core_of_Arden@lemmy.ml 37 points 1 month ago

Krita is a fantastic program for drawing. It's made for making beautiful paintings and animations.

[–] Core_of_Arden@lemmy.ml 36 points 1 month ago (4 children)

GIMP - unlike Krita - which is made for drawing - this is made for photo-editing. It's like Photoshop. The learning curve is a bit steep, but it is really powerful.

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[–] taaz@biglemmowski.win 35 points 1 month ago* (last edited 1 month ago)

Flameshot: screenshotting tool with everything you would ever need for screenshots

[–] Core_of_Arden@lemmy.ml 35 points 1 month ago* (last edited 1 month ago)

Firefox - the original private webbrowser. Even though some people don't like the options in it (like those that let you stream Netflix and other DRM content). If people care about privacy, they use this browser, or one that is made from it...

[–] PumpkinDrama@reddthat.com 35 points 1 month ago* (last edited 1 month ago)

Xournal++: A C++ handwriting note-taking software with PDF annotation support.

[–] PumpkinDrama@reddthat.com 32 points 1 month ago* (last edited 1 month ago) (3 children)

Nicotine+: A lightweight, free, and open-source graphical client for the Soulseek peer-to-peer file-sharing network.

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[–] Core_of_Arden@lemmy.ml 30 points 1 month ago* (last edited 1 month ago) (4 children)

Thunderbird - a brilliant e-mail program, which also handles contacts, newsfeeds, calender and more. It's available for multiple platforms, like Android, Windows, Linux and so forth...

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[–] PumpkinDrama@reddthat.com 30 points 1 month ago* (last edited 1 month ago) (1 children)

Helix Editor: A fast, post-modern text editor that combines modal editing and syntax awareness built in Rust for programmers.

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[–] a_person@piefed.social 29 points 1 month ago (2 children)

Mullvad vpn, probably the best vpn imo

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[–] callyral@pawb.social 28 points 1 month ago* (last edited 1 month ago) (2 children)

strudel. From the website:

With Strudel, you can expressively write dynamic music pieces.

The best place to actually make music with Strudel is the Strudel REPL

It's really fun to make music in it, I recommend trying it out!

link to repo (codeberg)

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[–] PumpkinDrama@reddthat.com 28 points 1 month ago* (last edited 1 month ago) (3 children)

Nuclear: A free, open-source music player that streams content from multiple free sources like YouTube, SoundCloud, and Bandcamp without ads or subscriptions.

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[–] commie@lemmy.dbzer0.com 27 points 1 month ago (2 children)

emacs, the text editor. it's so powerful and customizable that I feel listing any feature would do so many others a disservice

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[–] a_person@piefed.social 27 points 1 month ago

Comaps, navigation from openstreetmap

[–] Voroxpete@sh.itjust.works 27 points 1 month ago

Audiobookshelf. Not exactly a "hidden" gem at this point, but I'm putting it here for today's lucky 10,000. Simply the best way to store and stream audiobooks. Does podcasts too, and ebooks, although there are better tools for those.

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