The best open source alternative to Transifex is Weblate. If that doesn't suit you, our users have ranked more than 50 alternatives to Transifex and nine of them is open source so hopefully you can find a suitable replacement. Other interesting open source alternatives to Transifex are Tolgee, Zanata, Pootle and Mozilla Pontoon.
Weblate is a web based translation tool with tight VCS integration. It features simple and clean user interface, propagation of translations across components, consistency checks and automatic linking to source files.
You no longer have to worry about choosing the right i18n library, editor, or platform. Tolgee is the only tool you need to translate your web-based project to any language you wish.
Zanata is a web-based system for translators, content creators and developers to manage localisation projects.
It can be used without needing an own server and is free.
Online translation platform. Pootle allows your professional or community translators to easily complete localization tasks. For you it becomes easier to manage and monitor the distributed work.
From what I could see it has a nice user interface and the expected functionality. It's absolutely free, so for me it seems a good alternative.
Pontoon is a translation management system used and developed by the Mozilla localization community. It specializes in open source localization that is driven by the community and uses version-control systems for storing translations.
Cultural Translation Tool (CTT) was created to give better translations and to help businesses expand to other languages. It provides back translations, the translation back into the original language.
Translate terms with Google Spreadsheets, pull strings with a command line tool.
Czechia
EU
Australia
South Africa
United States
Tolgee has a more generous free plan