weblate.org

Copylefted libre software, used by over 2,500 libre software projects and companies in over 165 countries.

Localization & i18n Tools

Free for dev

Yes

Live Preview

Crowdin's localization management platform is a technology solution for your team.

GitLocalize is a powerful continuous localization platform for GitHub projects

Fast Machine Translation API at reasonable prices. Free Translation API trial with paid plans as low as US$0.30 per million translated characters.