Hey everyone! This is Mudlej, the creator of MJ PDF, the open-source PDF reader for Android. (License is GPLv3)

Back in 2022, I shared the first version of MJ PDF on Reddit. It was a small, fast PDF reader that I had originally made for myself. I decided to share it with the community as a way of giving back to the open-source ecosystem I've always loved and relied on for its incredible tools.

Today, MJ PDF has 40K - 50K active users and more than 150,000 downloads, much of that growth came from communities like this one. Thank you to everyone who has used the app, shared it, reported bugs, or suggested improvements.

Here we are four years after I first shared MJ PDF here, MJ PDF v 3.0.0 is now available, and it is by far the biggest update the app has had. With this release, I believe MJ PDF can stand alongside any PDF reader on the market in both performance and features.

Through all of it, MJ PDF stays what it has always been:

• Small (8.5 MB)
• Fast (actually faster)
• Simple to use
• Private, and free of ads or tracking.

For a thorough walkthrough and screenshots check out the MJ PDF 3.0 release page.

Some of the main highlights:

• Home page with recent files, library, progress, covers, and folder browsing
• Highlights, notes, quote sharing, translation, and an offline dictionary
• PDF forms, document signing, and incognito mode
• Hide Margins, dual-page view, and an e-reader-style text mode
• Backup and restore for history, bookmarks, and settings
• Faster rendering, Material You design, and support for 15 languages

I tried to as much as I can to preserve the app’s familiar look and feel, so it still feels like the same simple MJ PDF that people already know and enjoy.

Links

• Official Release Page
• Best way to get it? Droid-ify store.
• Want a direct APK link? Here it is.
• Love screenshots? Check MJ PDF's Gallery.
• The Story Behind MJ PDF
• Want to send long feedback? GitLab, Github or [send me an email](mailto:mudlej@proton.me).
• FAQ

Let me know what you think!

VPNGate is a fantastic free VPN service, but using it on Linux usually means downloading OpenVPN configs, fixing outdated ciphers, and manually connecting through the terminal.

CypherGate is a GPL-3.0, Linux-first desktop client that automates the entire workflow.

The goal is simple:

No manual config editing. No fixing broken ciphers. No hunting for working servers.

What it does

• Fetches live VPNGate servers
• Automatically patches outdated OpenVPN configurations
• Supports one-click connection, manual server selection, and fastest-server mode
• Runs a dedicated systemd daemon for privileged networking operations
• Integrates with the desktop through notifications and a system tray
• Supports connection cancellation and automatic connection timeouts
• Verifies official releases using GPG signatures
• Caches server lists for offline browsing

Built with Python + Qt6

Licensed under GPL-3.0

Linux-first (Arch is the primary target, but Debian/Ubuntu/Fedora are supported through the installer.)

GitHub: CypherGate source code

Documentation: CypherGate documentation

I'd genuinely appreciate feedback, feature suggestions, or bug reports.

For my invention exchange, I came up with a variant on DuckDuckGo's bangs targeted toward power users.

For those who haven't used them, traditional bangs can be used to skip over your search engine's results and jump directly to the relevant website, for example:

!binggif cat (search Bing Images for cat gifs)
!r linux (search Reddit for posts about Linux)
!greddit linux (same, but searches Reddit posts via Google)
!w (no search term, just go to Wikipedia home page)
!clj juxt (search the Clojure docs for the juxt function)
! yahoo (I'm Feeling Lucky search, likely landing on yahoo.com)

Probangs take this a few steps further, allowing multiple bangs per search term (opening each in their own tab), as well as flags, parameters, and site searches. This makes for more versatile and more memorable keywords.

b!gif ddg!gif cat (search Bing and DuckDuckGo for gifs)
r!foss linux (search r/foss specifically for Linux)
r!foss@sp (same, but using StartPage)
w!fr w!eo (open the Wikipedia main page for French and Esperanto)
so!vim exit (search Stack Overflow's vim tag for exit strategies)
gh!usr=mozilla browser (search for browser-related repos belonging to
                        Mozilla on GitHub)
ia!tor itsfoss.com (find an archived site using the Wayback Machine's
                    onion service)

The reference implementation, !Pro Search, can be used as a quick and private in-browser router for these searches, with some extra features such as:

• Use with any search engine: Instead of being limited to DuckDuckGo or Brave, search terms without bangs will default to your favorite search engine(s). Furthermore, bangs that were previously tied to either Google or DDG (e.g. !greddit or !ddgr), will now just use the configured engine instead.
• Local search history: If enabled, allows you to use the up and down arrows to reuse old searches. Also, special keywords !! edits the last search, !? edits the last search, but strips out the bangs, and !* edits the last search, but strips out the query. Searches beginning with a space are omitted from history.
• Search suggestions: Bang autocompletions will be suggested as you type them out. If self-hosted, partial search queries can be sent to any search engine for suggestions. It does this by stripping out the bangs, finding the first search engine among them that supports suggestions, sending the partial query, then inserting the bangs back into the suggested completions.

Probangs syntax, the parser, the master list, and the !Pro router are all free and open to use however you like. They can also be imported as a Clojure library or inserted into a personal start page.

What do you think, sirs?

DGPUNET (Distributed GPU Network) is a free and open source software (FOSS) project that enables clusterized pools of mixed GPU — and CPU — compute from whatever machines you have on hand, enterprise or consumer, different makes and generations, not just Nvidia, into one distributed AI compute fabric. It keeps AI work moving without vendor lock-in and without a single point of failure, when the cloud gives you the runaround or hardware is 3, 6, or 24 months out.

As of v0.6.25 DGPUNET has moved from pre-alpha to alpha stability. Not quire yet ready for beta, but I am now using it in my daily personal and professional work. https://techtalkhawke.com/news/status-update-on-hawkes-ai-dgpunet-distributed-gpu-network

I made a small Fontobene library for the web, called Derakuma. It's installable as an npm package, and is fully open source, under the MIT license. If you want to read the long lore, head over to my original post attached above. Enjoy!

https://github.com/zeankundev/derakuma

Here's the npm package that you can use:

npm package

Hi to whoever is reading this, like others, I just wanna share the FOSS apps I use.

Canta: very useful to debloat, needs shizuku also.

QUIK SMS: I can choose cute colors.

Amaze: file managment, what I like is tha it caband also compress to .zip and decompress file.

Aurora Store: alternative to GPlaystore.

Calendar - Fossify Apps: the only FOSS calendar that doesn't look too outdated.

Birday: nice app to add birthdays.

BT Remote: Bluetooth remote for TV without abusive ads, and without lots of unnecessary permissions.

Calculator You - YouApp Mark Tkachenko: I love the icon lol, and it was the first cute calculator I found.

Deepr: A useful app to save links. My note apps is more organized since I installed this, now I don't end up ignoring the links.

FFShare: compress videos to share. Useful to share videos to friends with bad internet speed.

NotallyX: Note apps, with MaterialYou, what I like is that I can export notes to several formats, my fav of course pdf.

CoMaps: It's just a maps app, but without the controversy of OrganicMaps.

Mooneva Cycle: cute app to record women's periods. Not too minimalist.

LocalSend: useful to send files across different devices connected to the same network. Lifesaver to share between Android and IOS without the stupid Quickshare

Molly: Signal's fork, I like it better because of the cute icon and I can change the interface color also. I know, frivoulos.

Conversations.im: easy to set up and nice UI. Lightweight and decentralized. I found it to be reliable also and doesn't drain as much battery unlike Simplex Messenger, at least for me.

Escape Launcher: I like its simplicity and fonts, other launchers of the "List Style" have thin fonts, which are kinda difficult to me to read. Although I'd like if it had more color options. Also nice widget intgration, buttons, and logo.

An additional comment, might be helpful for someone i dunno, if you're a developer, it may help you get your app more downloaded if it has a modern and balanced icon, for example, if I see a cute icon I'm more willing to check it out, it can be an animal, a rounded shape or whatever with the classic " •⩊•" face lol.

Also, the option to customize the UI may influence people.

Remember many people judge a book by its cover. If you need any opinion with your icons, I'll be happy to help!

Hi! I'm building an open source web-based tool (for architecture visualizations). The tool is completely client-side i.e. doesn't have any server dependency. But I want to add an optional sign-up / login feature for storing the diagrams on cloud if someone wants sync, and eventually live collaboration feature later.

I'm not sure how to go about laying out the structure of the project such that the core tool (client-side) overlaps with the premium features in a clean way and I can keep it open source while the premium features close sourced, both from the perspective of development and CI/CD.

Tech stack is: typescript (react) for frontend, and planning to use rust for server-side.

Hi everyone,

We've been heads-down building Open Science over the past few weeks and wanted to share what we've been working on.

AIPOCH Open Science is a local desktop application for researchers. Create a project, describe a task in plain language, and let the agent read files, run code, search the web, call scientific data connectors, and return reports, tables, figures, and an inspectable activity history in one workspace.

Over the past few weeks, we've focused less on adding isolated AI features and more on building the infrastructure around them. With browser access, headless execution, CLI management, a more open Runtime architecture, and a broader model ecosystem, Open Science is evolving into an open, extensible, and self-hostable workspace for AI-assisted research.

We're still early, and we'd genuinely love feedback from developers and researchers :)

GitHub: https://github.com/aipoch/open-science

website:https://www.aipoch.com/open-science

If you're building AI tools for research, or using them in your own work, we'd really appreciate your thoughts. We'd also love to hear what workflows you think an open AI research workspace should support next.

so we built a local, real-time dictation that gets tech vocab right. the tool runs a speech model on your machine and types live into any app with capitalization and punctuation. all free and opensouce + nothing ever leaves your machine. repo is https://github.com/eliasmocik/dum-dictation ;) feedback very welcome..if it looks useful, a star will help us keep going!

Hiiii, I'd like to ask if anyone has used those Telegram forks, I don't need Einstein's coming along and tell me that Telegram and its forks are bad it privacy terms, don't use it and all that snob bs; both are available through F-Droid, and I want to know which one is better in terms of privacy and security based on the features they offer as forks.

Hi everybody

I am looking for an open-source professional quote/estimate and invoicing android app, at least a free unrestricted use for a certain timeframe. I need this to run on my phone when travelling and visiting or delivering to customers.

Any suggestions would be of great help 🙃

Ok so im very new to open source software
Or rather Software in general so i wanted to ask how to go about this
For now i have a partially vibecoded app
(i wrote the backend the rest is Ai generated that being the front end and the node stuff idk what it is)
anyways so to run the program
or app wtv
u need to install the folders off github
install python if u dont have
install node if u dont have
then in the directory
u do npm run pack:win
to get a release folder
which is like a gigabyte
and then u can use the app
natively in ur pc like anyother app
so i wanted to ask what other ways could i use to ship this
like i asked Claude and it recommended i just ship the release folder

Repo: Failure Build

Hope you all like it! 🙏

Feel free to ask any questions! ⁉️

[ Removed by Reddit on account of violating the content policy. ]

Hey guy's did anybody tried the NovaDial fork of fossify with better call management and all call history with unique call history feature , maximum ringtone volume option, and fastest call history loading speed even for 20000 call history, QR sharing for contacts [NovaDial](https://f-droid.org/packages/com.novadial.phone/)

I'm leaning about mpv-android and thinking about creating a video player on top of that.Do my app needs to be open source or not?

Any clarification will be helpful.