Magic Stack

Tired of AirDrop flakiness and cloud uploads for things that never should leave your LAN?
This is #94 in my "100 Open-Source Projects" series — LocalSend.
LocalSend is an offline-first, open-source app that lets you transfer files securely between phones, tablets, and computers on the same network — no accounts, no cloud, no ads.
Why I like it (and why teams should care)
- Zero configuration: install and share immediately. Great for fast, frictionless workflows.
- True cross-platform: Windows, macOS, Linux, Android, iOS — one app across devices (built with Flutter).
- Privacy-first: end-to-end encrypted transfers using device-generated TLS certs, and no tracking.
- Works offline at full LAN/Wi‑Fi speed — ideal for large files or sensitive environments.
- Real-world traction: 8M+ downloads — people actually choose private, local-first tools.
- Used in security-critical contexts where data must never leave the local network.
When to pick LocalSend- You need fast, private ad-hoc transfers without cloud sync.
- Your org wants to avoid third-party cloud for sensitive files.
- You want a simple, self-hosted alternative to AirDrop/Drive/Dropbox for everyday sharing.

Want to help? The project welcomes contributions — Linux support, translations, and features like Bluetooth/Wi‑Fi Direct are actively sought. Even testing and feedback are useful.

Try it: localsend.org Code & contribute: https://github.com/localsend/localsend/localsend

Have you used LocalSend (or a similar offline tool)? What’s your go-to for quick secure file sharing — and what frustrates you most about it? Share below.

I haven’t opened Adobe Acrobat in months — and I’m not missing it.
StirlingPDF (Project #85 in my 100 Open‑Source Projects series) is a locally hosted web app that replaces a surprising amount of paid PDF tooling. Think: merging, splitting, OCR, conversions, batch processing, API access — 60+ tools in one package.
Why I’m excited:
- It’s built for offline, secure workflows — run it on your laptop, server, or behind your firewall.
- Enterprise-ready features (SSO, Docker/Kubernetes deployment, API) make it easy to add to team pipelines.
- Real adoption: 20M+ downloads and 150+ contributors in under 2 years — not a hobby project, it’s community scale.
How teams actually use it:- Batch OCR hundreds of files overnight and push text to your search index.
- Automate invoice splitting and metadata extraction in CI jobs.
- Host a shared instance behind SSO so legal and finance never send docs to external services.

The trade-offs: it’s rapid, community-driven, and free — so expect active updates and community support rather than enterprise SLAs. But for most productivity workflows it already replaces Adobe Acrobat for a fraction of the cost and with better data control.
Try it if you care about automation, privacy, or just not paying subscription fees for basic PDF work.
Have you tried StirlingPDF or another OSS PDF tool? Tell me one PDF task that still eats your time — I’ll reply with how StirlingPDF (or an alternative) could solve it.

https://github.com/Stirling-Tools/Stirling-PDF
https://docs.stirlingpdf.com

What if your CI could refuse bad code before it reaches production?
84/100 — SonarQube (open-source)
SonarQube is a self-hosted code-quality and security scanner that analyzes 30+ languages. The Community Edition is free for projects up to 100k lines of code and plugs into IDEs and CI systems (VS Code, Jenkins, GitHub Actions). Use it to detect bugs, vulnerabilities, and code smells, and to enforce quality gates before deployment.
Quick, practical way to adopt SonarQube:
- Start in your IDE: add SonarLint so developers catch issues while coding.
- Add SonarQube analysis to your CI pipeline and enforce quality gates to fail bad PRs.
- Focus on new code first. Triage hotspots and prioritize security-related findings.
- Use the Community Edition to avoid vendor lock-in — it can replace some paid analyzers for small-to-medium teams.
Why it matters: automated inspection shifts the work left, reduces review noise, and gives engineering teams measurable quality metrics instead of subjective feedback.
Have you used SonarQube in a CI pipeline? What configuration or rule saved your team the most time? Share one tip or one headache — I’ll feature the best responses in the next post.

https://www.sonarsource.com/open-source-editions/sonarqube-community-edition/

78/100 — Akaunting: an open-source QuickBooks alternative you can host yourself.
If you run a small business or freelance, Akaunting does the bookkeeping basics (invoicing, expense tracking, financial reports) — but with one big difference: you control where the data lives.
Why it matters:
- Web-based interface so your team can access it from any device.
- Multi-company and multi-currency support for real-world business complexity.
- Built with Laravel + Vue — modern stack, active codebase, and extensible via an app store.
- Core is GPLv3 open source (self-hosted) — great for privacy-conscious teams. Note: the free hosted tier was discontinued, but the self-hosted core remains free.
Real trade-offs to consider:- You can replace QuickBooks for many use cases and cut subscription costs.
- Self-hosting gives control and privacy, but you’ll need to handle backups, updates, and security.
- Extensions and client portals make it usable for agencies and service providers, but complex accounting workflows may still need customization.

If you’re curious: try the demo or scan the GitHub repo to judge install complexity and community activity before migrating.
Have you self-hosted accounting software before? What stopped you — or made you switch? Share your experience.

https://akaunting.com
https://github.com/akaunting/akaunting