If you're looking for apps you can use without patching, see this post.
However, if you're looking for apps you can patch, the following can help.
Let us know if any of these patches, patched apps, or guides don't work for you, or if we're missing any patches, patched apps, or guides from the list.
Android
Alerts for Reddit - Will continue to work unpatched as a freemium app.
On Windows, I use uBlock Origin + SponsorBlock + fuckfuckadblock + Enhancer for YouTube (which adds many features such as granular custom speed up to 14x and the ability to still sort by oldest first).
Others have suggested the Brave browser, as well as AdNauseam, a powerful and fascinating browser extension which invisibly clicks every ad you're served without actually showing them to you, thus confusing cookie trackers.
On Android, I use ReVanced Extended. To open YouTube links in ReVanced instead of the default app, long press on the default YouTube app, hit the info button, and disable the app, then long press on ReVanced, open its info page, and check all four URLs under "open by default."