I want to say the Natron compositing software, but I could be misremembering.
I seem to recall it losing it’s only maintainer and therefore being updated or maintained anymore. I want to say this was back in 2018, but since it’s not a piece of kit I use often, I don’t really think about it enough for it to stick in my head. Anyway…point being. It posted a fairly large update in 2022 and has been doing updates since then.
Okular is great. Kate is amazing. Kdenlive is BY FAR the most advanced FOSS video editor. I’d easily put Kdenlive above Krita, but that’s because of my particular use case.