The Open XLIFF Internationalisation Content Editor.
It is for those unfortunate people who are looking for a tool to work with XLIFF files but are neither allowed to install one of the available programs on their (company-) computer and also may not have access to paid online services.
XLIFF 1.2 and 2.0
Not the full set of possibilities of the two formats is supported. The narrow focus is to just make it through the day with what you usually need for translation files that are part of an Angular application that uses the standard internationalisation.
It works as a "single page application". All that you need to work with the translation file is loaded right into your browser. The translation files used in the app will always stay on the local machine.
A working version can be found on GitHub Pages
It is a regular Angular application. Read the documentation at the Angular homepage if you're unfamiliar with it. The project has a rather liberal license. Grab the source code and do what is necessary for your requirements.
Building, running a development server and all the other nitty-gritty is the standard "out of the box" behaviour of Angular projects.