websites
wikipedia
Wikiless - https://codeberg.org/orenom/Wikiless
quora
Quetre - GitHub - zyachel/quetre: A libre front-end for Quora
imgur
rimgo - video-prize-ranch/rimgo: An alternative frontend for Imgur. - rimgo - Codeberg.org
imdb
libremdb - GitHub - zyachel/libremdb: A free & open source IMDb front-end.
libreddit - GitHub - libreddit/libreddit: Private front-end for Reddit
teddit - GitHub - teddit-net/teddit: alternative Reddit front-end focused on privacy https://teddit.net
google translate (+ libretranslate)
SimplyTranslate - SimpleWeb/SimplyTranslate-Web: Web Interface for SimplyTranslate built with python and quart - SimplyTranslate-Web - Codeberg.org
medium
scribe - Scribe: An Alternative Medium Frontend
reuters
neuters - GitHub - HookedBehemoth/neuters: Reuters Redirect and Proxy
youtube music
beatbump - GitHub - snuffyDev/Beatbump: Alternative YouTube Music frontend built with Svelte/SvelteKit 🎧
apps
youtube music
ViMusic - GitHub - vfsfitvnm/ViMusic: An Android application for streaming music from YouTube Music.
alternative streaming frontend for hundreds of sites
Cloudstream - GitHub - recloudstream/cloudstream: Android app for streaming and downloading Movies, TV-Series and Anime.
Disclaimer: This app comes empty as default, and you can add repositories that include “extensions” (providers) post-install. (keep in mind some sites are legal, some aren’t, so add providers at own risk.) Anyone can make there own repo/extensions for this app, contributing to the amount of site available. legal-provider examples - iptv-org, crunchyroll, and more.
P.S.
there are other alt-frontends, like android apps for reddit, but i am only including ones i have experience with. see GitHub - mendel5/alternative-front-ends: Overview of alternative open source front-ends for popular internet platforms (e.g. YouTube, Twitter, etc.) for more.