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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[–] pineapple@lemmy.ml 1 points 15 hours ago

tag studio It's a file manager designed to use tags instead of files because tags are a much better system. It's still in alpha and I haven't actually tested it yet but I plan to use it instead of regular file managers once it becomes stable and well supported.

[–] sic_semper_tyrannis@lemmy.today 2 points 17 hours ago* (last edited 17 hours ago)

SherpaOnnx TTS for Android. There are many different voices to pick from that sound very life like and are totally worth using with GPS apps like CoMaps.

Also, just found out about Medicat recently but haven't used it yet. It looks fantastic though: Medicat is a toolkit that helps compile a selection of the latest computer diagnostic and recovery tools into an easy to use toolkit.

Ventoy is a software you put on a USB stick to make it so you can load as many bootable ISOs as you want on it at the same time and still use the leftover space for normal file storage.

[–] Dreaming_Novaling@lemmy.zip 3 points 21 hours ago

FMD (FindMyDevice) - An absolute necessity, especially if you aren't using Google services.

It allows you to use any device/contact you've approved to send commands to enable/disable various settings on your devices, like bluetooth, do not disturb, camera, GPS, etc. via SMS, a FMD server (self-host optional) or from notifications (i.e. use Signal to send commands). So if you've simply lost your phone in your house you could make it ring no matter what, or if it got stolen you could lock it, use GPS, or factory reset it entirely.

The dev made it after he lost a phone that didn't have Find My Device activated.

[–] Core_of_Arden@lemmy.ml 45 points 5 days ago* (last edited 5 days 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...

[–] EvanescentWave@discuss.tchncs.de 40 points 5 days ago (3 children)

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

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[–] Core_of_Arden@lemmy.ml 42 points 5 days ago (6 children)

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

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[–] Core_of_Arden@lemmy.ml 36 points 5 days ago* (last edited 5 days 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...

[–] Core_of_Arden@lemmy.ml 35 points 5 days 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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[–] Core_of_Arden@lemmy.ml 35 points 5 days ago

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

[–] PumpkinDrama@reddthat.com 212 points 6 days ago* (last edited 6 days ago) (13 children)

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

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[–] lemmy_ng@lemmy.ml 16 points 4 days ago

alternativeto.net is great for finding these

[–] TheOrionArm@lemmy.world 42 points 5 days ago

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

[–] kazerniel@lemmy.world 42 points 5 days ago (1 children)

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

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[–] kazerniel@lemmy.world 40 points 5 days ago (2 children)
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[–] toothbrush@lemmy.blahaj.zone 159 points 6 days ago* (last edited 6 days ago) (25 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.

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[–] Core_of_Arden@lemmy.ml 27 points 5 days ago* (last edited 5 days 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...

[–] Dreaming_Novaling@lemmy.zip 2 points 3 days ago

Just wanted to say that mobile Outlook had a stroke trying to let me login to my school account after doing a mandated password change, while Thunderbird let me login issue free. So yeah, Thunderbird is where I check my mail now (outside of my proton mail account)

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[–] callyral@pawb.social 28 points 5 days ago* (last edited 5 days 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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[–] LambdaRX@sh.itjust.works 80 points 6 days 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 135 points 6 days ago* (last edited 6 days ago) (14 children)

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

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[–] KarnaSubarna@lemmy.ml 13 points 4 days ago

NextCloud - Self hosted personal cloud solution that you can run on Docker or bare metal.

https://nextcloud.com/

[–] BorgDrone@feddit.nl 11 points 4 days ago (1 children)

fzf fuzzy finder. Great tool to quickly find those files you were looking for.

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[–] Artisian@lemmy.world 12 points 4 days ago (2 children)

Librera (android pdf+ reader).

I spend a lot of time reading pdfs on my phone, this has done an excellent job. Well featured, responsive, and seems respectful of the battery.

Ads or payment if you buy from the playstore, but free on F-droid and source code is here.

[–] Dreaming_Novaling@lemmy.zip 2 points 3 days ago

+1 to Librera, I read downloaded fanfics on it when I'm on a long trip with no Wi-Fi. Very customizable, and can have an extremely dim dark mode.

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[–] Voroxpete@sh.itjust.works 93 points 6 days 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.

[–] pineapple@lemmy.ml 2 points 15 hours ago

Local send has worked really poorly for me, and so has every program similar to it open source or not. The only network file sharing program that has always worked (mostly) floorlessly for me is AirDrop.

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[–] Dreaming_Novaling@lemmy.zip 70 points 6 days 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.

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 94 points 6 days ago* (last edited 6 days 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 92 points 6 days ago* (last edited 6 days ago) (3 children)

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

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[–] apprehensively_human@lemmy.ca 53 points 6 days ago (3 children)

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

[–] pineapple@lemmy.ml 1 points 15 hours ago

Immich is the GOAT! I can't wait for it's stable release.

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[–] PumpkinDrama@reddthat.com 65 points 6 days 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 77 points 6 days ago* (last edited 6 days 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 75 points 6 days ago (3 children)

Rustdesk.

It's TeamViewer / AnyDesk without the headaches.

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[–] hard_zero1@discuss.tchncs.de 58 points 6 days ago (4 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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[–] kazerniel@lemmy.world 20 points 5 days ago

MusicBrainz Picard: superb mp3 tagger with online metadata lookup feature and audio track fingerprinting

[–] PumpkinDrama@reddthat.com 71 points 6 days ago* (last edited 6 days ago) (2 children)

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

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[–] PumpkinDrama@reddthat.com 65 points 6 days ago* (last edited 6 days ago) (3 children)

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

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[–] Kalcifer@sh.itjust.works 44 points 6 days ago* (last edited 5 days ago)

Lemmy ^[1]^

References

  1. Type: Website. Title: "Lemmy". Accessed: 2025-08-03T05:12Z. URI: https://join-lemmy.org/.
[–] Sergio@lemmy.world 16 points 5 days ago

Vassal - an open-source (LGPL-2.1) boardgame engine. basically, people build different modules for each game they want to play, then they can play that game over the internet or solo. Mostly focused on "chit-and-hex" style wargames.

[–] hard_zero1@discuss.tchncs.de 47 points 6 days ago (3 children)

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

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[–] brisk@aussie.zone 55 points 6 days 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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[–] kazerniel@lemmy.world 16 points 5 days ago

and lastly, Tor Browser: anonymous web browser to evade state censorship and surveillance

[–] Zerush@lemmy.ml 17 points 5 days ago (2 children)

Tox is easy-to-use software that connects you with friends and family without anyone else listening in. While other big-name services require you to pay for features, Tox is completely free and comes without advertising. Chat, P2P serverless, screen/file sharing, voice, video, groups, encrypted.

https://tox.chat/

https://github.com/TokTok/c-toxcore

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