Best open source software in 2026

The canonical example of the category and still one of the most useful. LibreOffice gives you a word processor, spreadsheet, presentation tool, database and drawing app that install locally, work offline and read and write Microsoft formats well enough for everyday exchange. For home use, study and a great many small organisations, the gap between this and a paid Office subscription is smaller than the price difference suggests.

Where it shows is at the edges: complex Excel workbooks with macros and pivot-heavy models do not always survive the round trip, and the interface is functional rather than polished. If your work involves passing intricate spreadsheets back and forth with Microsoft users all day, stay where you are. For everything else, it has been quietly good for years.

The tool that proves open source can win outright rather than merely substitute. Bitwarden does everything a paid password manager does, syncs across every platform, has been through independent security audits, and its free tier includes unlimited passwords on unlimited devices, which the commercial competition does not offer. When the code that protects every account you own can be inspected by anyone, that is a real argument rather than an ideological one.

The apps are slightly less polished than 1Password's and the sharing features aim at teams rather than families. Neither is a reason to pay ten times more. You can also self-host the server if you want the vault on your own hardware, which almost nobody needs and some organisations require. See the best password managers guide for how it compares against the paid options.

The long-standing free answer to Photoshop, and capable of most of what people actually use Photoshop for: retouching, compositing, masks, layers, colour work and batch processing. For anyone editing images occasionally rather than professionally, paying a monthly fee for Adobe when this exists is hard to justify, and it runs on hardware that Creative Cloud would struggle on.

It is not a drop-in replacement. The interface follows its own logic rather than Adobe's, so existing Photoshop muscle memory works against you for the first week, and it trails on the newest generative editing features. Designers working to client deadlines in an Adobe workflow will keep Adobe. Everyone else should try this before signing up for anything.

The credible open source design tool, and the one Figma's price rises sent people looking for. Penpot runs in the browser, handles interface design and prototyping collaboratively, and is built on open web standards, so files are not locked inside a proprietary format. It is also the rare design tool that a company can host on its own infrastructure, which matters in regulated industries where cloud design tools are simply not permitted.

Figma still has the deeper feature set, the plugin ecosystem and the industry gravity, so a team that lives inside Figma all day will notice what is missing. As the answer to "what if we could not use Figma", whether for cost, sovereignty or principle, it is far better than it needed to be.

The strongest single argument that open source can beat commercial software outright. Blender does modelling, sculpting, animation, simulation, rendering, compositing and video editing in one application, it is used in real film and games production, and the competition costs thousands of pounds a seat. It is not a cheaper substitute for Maya or Cinema 4D; in several areas it is simply the better tool now.

The learning curve is the price, and it is a real one: this is professional software with the depth that implies, and the first week is humbling. The tutorial ecosystem is enormous, which helps. If you have any interest in 3D at all, there is no reason to start anywhere else.

Analytics where the visitor data stays yours. Matomo covers the reporting most sites actually use, and because you can host it yourself, the data never reaches a third party, which makes privacy compliance a much shorter conversation. It can also run without cookie consent banners in many configurations, which is a tangible improvement to the visitor experience rather than a philosophical win.

Self-hosting means you maintain it, and on a large site that is a real database to look after. The hosted plan removes that but reintroduces a bill. Against Google Analytics it trades some depth of machine learning reporting for ownership and clarity, which for most sites is a good trade. Lighter alternatives exist too, including Umami and PostHog in the directory.

A backend platform giving you a database, authentication, file storage and realtime APIs in an afternoon, with one decision that matters more than the rest: it is built on Postgres. Where a proprietary backend traps your data in a shape only that vendor understands, anything you build here sits in the most standard database there is, and you can take it elsewhere or run the whole platform yourself.

It is younger than Firebase and the surrounding ecosystem is smaller, so you will occasionally hit an edge Google smoothed over years ago. The trade is knowing that a pricing change or a shutdown notice is an inconvenience rather than a rewrite, which for anything you intend to still be running in five years is worth a lot.

File sync and sharing, plus calendars, contacts, chat and collaborative document editing, all running on a server you control. For schools, clinics, public bodies and anyone else who cannot put files in someone else's cloud, Nextcloud is the established answer, and it has grown into a genuine Google Workspace equivalent rather than a Dropbox clone.

This is the entry on the list with the highest real cost, because someone has to run it: a server, updates, backups and a person who notices when sync breaks. Done properly it is excellent and the data is unambiguously yours. Done casually it becomes the thing nobody wants to be responsible for. Be honest about which you are before you start.