Weather, MS Translator, MS Movies & TV, and some RSS readers (like Feedlab).
You can manually install .appx or .xap files downloaded from trusted third-party repositories like Appx4Fun . Windows Phone Apps Download For Mobile
Transfer the downloaded app package to your phone, find it in the File Explorer app, and tap it to install. Weather, MS Translator, MS Movies & TV, and
Since official support has ended, many "apps" that depend on live servers may not function even if installed: MS Movies & TV
Sideloading apps involves risks as these files are not reviewed by Microsoft. Always use reputable community sources to avoid security vulnerabilities.
Third-party developers on platforms like Reddit continue to build custom browsers and messaging clients (e.g., Unigram for Telegram) to keep devices usable.