For example, I've seen a lot of gif memes on the internet, in which the text was always very badly jumping around and it was very difficult to make them. So I've spent a few hundreds of hours making https://gifmemes.io. (actually as my bc. project :D)
Another project I'm working on right now comes from my frustrations with language learning apps. I don't care about leaderboards/scores/trophies/chatting with ai or whatever. I JUST want to learn enough vocabulary to be able to listen to podcasts and watch Netflix in German. So Anki might be good, right? But it just was so combursome to use, creating the cards or finding good decks. So I'm creating https://vokabeln.io, it's like Anki, but "AI" enhanced. Sentences, word explanations and audios are generated, so adding new words is super easy.