Open-source Lilt alternatives

Weblate is a localization tool you use in the browser, closely integrated with version control. You connect your repository, translators work in the browser, and new strings and finished translations flow between the repository and Weblate so localization keeps pace with development.

The project website emphasizes quality and control. Translators get context, shared terminology and quality checks, and teams can work exclusively with people or add AI and machine translation. Repository topics reference gettext, continuous localization and crowdsourcing. It is used by both community projects and commercial products, and the Weblate project itself, along with many open-source applications, are translated on its hosted service.

Weblate is written in Python with Django and licensed under GPL-3.0. The homepage describes it as free to use, inspect, modify and share, suitable for organizations and communities. You can run it yourself or choose hosting and support options, which are compared on the vendor's hosting page.

Lingo.dev is a set of open-source localization engineering tools that connect to the Lingo.dev platform. It is aimed at product teams that translate their software into multiple languages and want that work to be consistent, measurable and automated, instead of passing strings around by hand.

On the platform, teams configure localization engines with glossaries, brand voice and per-locale chains of language models, and call them from code, the command line, CI/CD pipelines or MCP. Quality criteria that teams define in plain words are used to score translations from LLMs and from native speakers, so low-scoring languages can be found and traced back to a model, a rule or a missing glossary term.

The open-source repository, written in TypeScript and licensed under Apache-2.0, includes a command-line tool and a compiler package, and its topics point to React and React Native projects. A hosted platform with sign-in, pricing and enterprise options sits alongside it.