Open alternatives1
Open-source apps that replace Google Translate and DeepL

LibreTranslate is a free program that translates text and can be run on your own server. It is aimed at developers and organizations who want translation through an API without sending text to big proprietary services.
What's missing
What people still miss here, and wish existed. Upvote what matters to you.
Before you build
Planning something for translation? See what exists first, so you can reuse parts or explain what's different. Paste this into any AI assistant:
Fix the list itself
A project or closed app missing from this list, or a mistake on it? These open a short form on GitHub, and a mod reviews it. To say what a project can't do, use What's missing.
About this page
Replaces fully means it does the main job of these apps; Replaces partly means it covers some of it.
Licenses: every project here uses an open-source license (what each one means). Open core means some parts are paid or under another license.
GitHub stars are shown for reference. They measure popularity, not whether it replaces anything.
Verified means r/TrueOpenSource mods checked it: open-source license, maintained, and it really does the job.
How Open Source Everything works