Why it matters
Free tools don't buy ads, so most business owners never hear about them. These ten are open source projects on GitHub. I checked each one's license and star count on October 1, 2026, and the numbers below come from that day.
Most of them install from the project's own README. If the steps look unfamiliar, paste the README into Claude or ChatGPT and ask it to walk you through, one step at a time.
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Start with these three
- LocalSend. Install it on two devices and send a file between them. Nothing to host and nothing to sign up for.
- changedetection.io. Point it at a competitor's pricing page and get an alert the next time it changes.
- Uptime Kuma. Get an alert when your website goes down, before a customer tells you.
LocalSend works right away. The other two run on a small server or a computer you leave on, so give yourself half an hour.
The full list
1. cobalt
Paste a link from TikTok, Instagram, X, YouTube or Reddit and get the file back. I ran it on my own computer and pulled a whole Instagram carousel from one link. Only save content you made or have permission to reuse. github.com/imputnet/cobalt · 44K stars · AGPL-3.0
2. SearXNG
A private search engine you run yourself. It asks Google, Bing and many other engines at once and shows you one page of results, with no ads and no profile built on what you type. github.com/searxng/searxng · 38K stars · AGPL-3.0
3. Reactive Resume
A resume builder that keeps your data private. Make as many resumes as you like and export the PDF without hitting a paywall. Handy when you hire, or when someone on your team needs a quick resume. github.com/reactive-resume/reactive-resume · 44K stars · MIT
4. changedetection.io
Watch any web page and get a message when it changes. Use it for a competitor's prices, a supplier's restock, a job post or a permit page. github.com/dgtlmoon/changedetection.io · 35K stars · Apache-2.0
5. Uptime Kuma
A monitoring dashboard that checks your website, server or API on a timer you set and sends an alert when something stops answering. github.com/louislam/uptime-kuma · 92K stars · MIT
6. LibreTranslate
A translation server that runs on your own machine, offline if you want. Feed it text or whole documents. There's no per-character fee and no Google account involved. Useful for translating a menu, a quote or a customer message. github.com/LibreTranslate/LibreTranslate · 17K stars · AGPL-3.0
7. gallery-dl
A command line tool that downloads whole galleries or accounts of images from a long list of sites, with captions and metadata attached. It's for saving your own work or material you have rights to. github.com/mikf/gallery-dl · 20K stars · GPL-2.0
8. ArchiveBox
Give it a link and it keeps a copy: the page, a PDF, a screenshot and the media. If the original gets edited or deleted, your copy still opens. A good fit for saving reviews, press mentions or anything you may need as a record. github.com/ArchiveBox/ArchiveBox · 29K stars · MIT
9. LocalSend
Send files between Windows, Mac, Linux, Android and iPhone over your own wifi. No account, and nothing is uploaded to anyone's server. github.com/localsend/localsend · 93K stars · Apache-2.0
10. Vaultwarden
A small server that works with the official Bitwarden apps, so your logins live on hardware you control. It's an unofficial project, separate from Bitwarden. Read its setup notes first, and ask someone technical to help before you trust it with your team's passwords. github.com/dani-garcia/vaultwarden · 68K stars · AGPL-3.0
Copy-paste prompt
I run a small business and I'm not technical. I want to try [TOOL NAME] from [GITHUB LINK]. Read its README and tell me: 1. What it does in two plain sentences. 2. What I need before I start (a computer that stays on, a small server, an account). 3. The setup steps, one at a time. Wait for me to say "done" before the next one. If a step needs a password or an API key, tell me where it goes and don't ask me to paste it into this chat.
Open source means the code is public and you can run it free. It doesn't mean it's supported. If something breaks, the project's GitHub issues page is where help lives.
