Open Source Apps Every Business Should Know About
Why Open Source Matters for Business
Most businesses are paying monthly subscriptions for software they could run themselves for free. Invoicing, CRM, project management, monitoring - there are mature, well-maintained open source alternatives for all of them. The difference is that you own the data, you control the updates, and you are not locked into a vendor who might raise prices or shut down.
The best part? Nearly all of these tools can be installed with a single Docker command. Spin them up on a cheap VPS, a spare server, or even your own laptop for testing. No enterprise sales calls, no per-seat pricing, no nonsense.
Here are four open source apps we think every small business should have on their radar.
Invoice Ninja - Professional Invoicing Without the Price Tag
If you are still sending invoices from a spreadsheet or paying Xero monthly for features you barely use, Invoice Ninja is worth a serious look. It handles quotes, invoices, recurring billing, expense tracking and payment processing. The interface is clean, the PDF templates are customisable, and it integrates with Stripe, PayPal and a stack of other payment gateways.
The self-hosted version is completely free and open source. You get the full feature set with no restrictions - no per-client limits, no watermarks, no artificial caps. For freelancers and small agencies, it is genuinely hard to justify paying for anything else.
Installation is straightforward with Docker Compose. A single YAML file, a quick docker compose up, and you have a full invoicing platform running behind your own domain.
Umami - Privacy-Focused Web Analytics
Google Analytics is powerful, but it is also bloated, complicated and increasingly problematic from a privacy standpoint. Umami strips analytics back to what actually matters: page views, referrers, device breakdowns and real-time visitor data. No cookies, no tracking scripts that slow your site down, and full GDPR compliance out of the box.
The dashboard is fast and minimal. You get the numbers you need without wading through endless menus and custom report builders. For most business websites, Umami tells you everything Google Analytics does - just without the complexity and the data harvesting.
It runs happily on a small VPS with a PostgreSQL or MySQL database. One Docker container, a reverse proxy, and you are done.
Uptime Kuma - Know When Things Go Down
Uptime Kuma is a self-hosted monitoring tool that watches your websites, APIs and services and alerts you the moment something goes wrong. It supports HTTP, TCP, DNS, Docker and ping checks. Notifications go out via Slack, Discord, Telegram, email, webhooks - pretty much anything you can think of.
The setup takes about two minutes. Run the Docker container, open the web UI, add your monitors and configure your notification channels. It is one of those tools that sits quietly in the background doing its job until something breaks - and then you are very glad it is there.
For agencies managing multiple client sites, Uptime Kuma is essential. We run it on a Hetzner VPS and it monitors every site we manage. The status page feature is a nice bonus for clients who want to see uptime stats.
Twenty CRM - The Modern Open Source CRM
CRM software is notoriously expensive. Salesforce, HubSpot, Pipedrive - they all start cheap and get pricey fast once you need proper features or more users. Twenty is a new open source CRM that takes a different approach. It is modern, fast, and built with a clean UI that does not feel like it was designed in 2008.
Twenty handles contacts, companies, deals, tasks and email integration. The data model is flexible and the API is well documented, which means you can connect it to your existing tools without much hassle. It is still relatively young compared to something like SuiteCRM, but the pace of development is impressive and the community is growing quickly.
Like everything else on this list, it runs in Docker. Pull the image, configure your environment variables, and you have a CRM that rivals paid platforms at a fraction of the cost - which is zero.
Getting Started with Self-Hosting
You do not need to be a systems administrator to run these tools. A basic VPS from Hetzner or DigitalOcean (starting around four pounds a month) is more than enough to host several of these applications. Install Docker, set up a reverse proxy with Traefik or Caddy, point your DNS records, and you are in business.
If Docker feels like a stretch, managed platforms like Coolify or CapRover give you a one-click deployment experience on your own server. All the benefits of self-hosting without the manual configuration.
The Bottom Line
Open source is not a compromise. These tools are production-ready, actively maintained and used by thousands of businesses worldwide. The money you save on SaaS subscriptions can go back into growing your business. And when you own the infrastructure, you are never at the mercy of a vendor changing their pricing, their terms or their product direction.
We help businesses set up and manage self-hosted tools as part of our infrastructure and automation services. If you want to explore what open source could do for your business, get in touch.