I’ve been building Velty[1] over the past year as a tool to tame my ever-growing YouTube subscriptions. It’s a web app (PWA) that lets you organize your YouTube channels and videos into folders (with sub-folders), and view all the latest videos in one chronological feed with powerful filtering/sorting.
I built it because I was frustrated with how hard it was to manage a large number of channel subscriptions using YouTube’s default interface.